Add link to GLOMAP example. (#7097)

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### What
See title.


![glomap_colosseum](https://github.com/user-attachments/assets/55db7c84-055a-4245-9b55-7b8fd2642dc8)


### Checklist
* [x] I have read and agree to [Contributor
Guide](https://github.com/rerun-io/rerun/blob/main/CONTRIBUTING.md) and
the [Code of
Conduct](https://github.com/rerun-io/rerun/blob/main/CODE_OF_CONDUCT.md)
* [x] I've included a screenshot or gif (if applicable)
* [] I have tested the web demo (if applicable):
* Using examples from latest `main` build:
[rerun.io/viewer](https://rerun.io/viewer/pr/7097?manifest_url=https://app.rerun.io/version/main/examples_manifest.json)
* Using full set of examples from `nightly` build:
[rerun.io/viewer](https://rerun.io/viewer/pr/7097?manifest_url=https://app.rerun.io/version/nightly/examples_manifest.json)
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`CHANGELOG.md` and the migration guide

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Author: 02alexander

examples/manifest.toml

@@ -98,6 +98,7 @@ examples = [
   "kiss-icp",
   "differentiable_blocks_world",
   "stereo_vision_slam",
+  "glomap",
   "signed_distance_fields",
   "raw_mesh",
 ]

examples/python/glomap/README.md

@@ -0,0 +1,17 @@
+<!--[metadata]
+title = "GLOMAP"
+tags = ["3D", "Point cloud", "GLOMAP"]
+source = "https://github.com/rerun-io/glomap"
+thumbnail = "https://static.rerun.io/glomap-thumbnail/d0052fe6083b1e1d5698792ed0efec4d9cfd2f75/480w.png"
+thumbnail_dimensions = [480, 342]
+-->
+
+https://vimeo.com/995792438?loop=1&autopause=0&background=1&muted=1&ratio=2802:1790
+
+## Background
+
+GLOMAP is a general purpose global structure-from-motion pipeline for image-based sparse reconstruction. As compared to COLMAP it provides a much more efficient and scalable reconstruction process, typically 1-2 orders of magnitude faster, with on-par or superior reconstruction quality. In the video we see it's global positioning step where it performs a joint global triangulation and camera position estimation starting from a randomly initialized state.
+
+## Run the code
+
+This is an external example. Check the [repository](https://github.com/rerun-io/glomap) for more information on how to run the code.