Add AWS CodeCommit examples for push request and also README to configure AWS CodeCommit

examples/v1beta1/awscodecommit/push/README.md

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+## AWS CodeCommit push EventListener
+
+Creates an EventListener that listens for AWS CodeCommit push request.
+
+### Pre-requisites
+
+1. Enable [debug logs for Triggers eventlistener](https://github.com/tektoncd/triggers/blob/main/docs/troubleshooting.md#configuring-debug-logging-for-eventlisteners)  (This will be helpful for getting subscription URL which you do in later section)
+2. Should have access to AWS
+1. Should have URL accessible publicly to configure in webhook
+
+### Steps to try:
+
+1. To create the AWS CodeCommit push eventlistener and all related resources, run:
+
+   ```bash
+   kubectl apply -f .
+   ```
+
+1. To get the eventlistener URL, run:
+
+   ```bash
+   kubectl get el
+   ```
+
+### Steps for AWS CodeCommit configuration
+
+1. Login to aws console
+2. Search for CodeCommit aws service
+3. On left side of the panel select **Source** -> **Repositories** -> **Create repository**
+ ![img.png](images/img.png)
+4. Once after successful creation of repository follow below steps to add Triggers
+5. a) Create SNS (Simple Notification Service)
+
+   ai) Search for sns service
+   ![img.png](images/sns.png)
+
+   aii) Click on Create topic
+
+   ![img.png](images/createtopic.png)
+
+   aiii) Click on **Create subscription**
+
+   1. 
+   ![img.png](images/createsubscription.png)
+   2. 
+   ![img.png](images/createsubscriptionsuccess.png)
+   3. Once **Create subscription** is success click on **Request confirmation**
+   ![img.png](images/requestconfirmation.png)
+      a. Then go to eventlistener pod
+
+      i. oc logs -f <pod-name>
+
+      ii. Search for SubscribeURL and copy value
+
+            "SubscribeURL\" : \"https://sns.us-east-2.amazonaws.com/?Action=ConfirmSubscription&TopicArn=arn:aws:sns:us-east-2:361754793035:demo-acc-tekton&Token=2336412f37fb687f5d51e6e2425c464de257e9a5924e2fd4cf343ac0f1dcdb40cc7dad021f86dcf2af98fbabf59b6314b975e5d5bfc673924522ab99cb9b45b824a2795d81328e045db0148571c0ba451648f60157690c2c377eb41f58a7d663c15a36654beda27c295f9f90cc8a0f46096aea96a40f9c4ca0b1ec1092e32116\"
+
+   4. Click on **Confirm subscription**
+
+      ![img.png](images/confirmsubscription.png)   
+   5. Make sure Status as **Confirmed**
+
+      ![img.png](images/confirmed.png)
+
+   aiv) Now go back to CodeCommit page
+
+**!!!!!Done with SNS configuration go back to codecommit flow!!!!!**
+
+   b) **Source** -> **Repositories** and select demo-acc-tekton
+      ![img.png](images/selectrepo.png)
+
+   c) Go to **Settings -> Triggers** then click on **Create trigger**
+      ![img.png](images/createtrigger.png)
+
+   d) While creating trigger give trigger name, set the events to All repository events, Service to use AWS SNS, and finally, choose the previously configured SNS topic
+      ![img.png](images/createtriggersuccess.png)
+   e) Once the **Create trigger** is successful go back to Repository and send Push Request.
+
+**!!!!!Done with CodeCommit configuration!!!!!**
+
+   f) You should see a new TaskRun that got created:
+
+   ```bash
+   kubectl get taskruns | grep aws-codecommit-push-listener-run-
+   ```

examples/v1beta1/awscodecommit/push/awscodecommit-push-listener.yaml

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+apiVersion: triggers.tekton.dev/v1beta1
+kind: EventListener
+metadata:
+  name: aws-codecommit-push
+spec:
+  triggers:
+    - name: aws-codecommit-push
+      bindings:
+        - ref: aws-codecommit-push-binding
+      template:
+        ref: aws-codecommit-push-template
+  resources:
+    kubernetesResource:
+      spec:
+        template:
+          spec:
+            serviceAccountName: tekton-triggers-example-sa
+            containers:
+              - resources:
+                  requests:
+                    memory: "64Mi"
+                    cpu: "250m"
+                  limits:
+                    memory: "128Mi"
+                    cpu: "500m"
+
+---
+apiVersion: triggers.tekton.dev/v1beta1
+kind: TriggerBinding
+metadata:
+  name: aws-codecommit-push-binding
+spec:
+  params:
+    - name: aws-codecommit-awsregion
+      value: $(body.Records[0].awsRegion)
+    - name: aws-codecommit-commit
+      value: $(body.Records[0].codecommit.references[0].commit)
+    - name: aws-codecommit-branch
+      value: $(body.Records[0].codecommit.references[0].ref)
+    - name: aws-codecommit-useridentity
+      value: $(body.Records[0].userIdentityARN)
+---
+apiVersion: triggers.tekton.dev/v1beta1
+kind: TriggerTemplate
+metadata:
+  name: aws-codecommit-push-template
+spec:
+  params:
+    - name: aws-codecommit-awsregion
+    - name: aws-codecommit-commit
+    - name: aws-codecommit-branch
+    - name: aws-codecommit-useridentity
+  resourcetemplates:
+    - apiVersion: tekton.dev/v1beta1
+      kind: TaskRun
+      metadata:
+        generateName: aws-codecommit-push-listener-run-
+      spec:
+        taskSpec:
+          steps:
+            - image: ubuntu
+              script: |
+                #! /bin/bash
+                echo "aws region is : $(tt.params.aws-codecommit-awsregion). commit is $(tt.params.aws-codecommit-commit).
+                branch name is : $(tt.params.aws-codecommit-branch). pusher name is $(tt.params.aws-codecommit-useridentity)."

examples/v1beta1/awscodecommit/push/rbac.yaml

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+../../../rbac.yaml