feat(library): Introduce WAMR

Introduce WAMR (Wasm Micro Runtime) native application for Unikraft. The
version used is an older commit (pre-stable release): `bc762f`.

Add required files: `Kraftfile`, `Makefile.uk` and `README.md`.

The root filesystem (in `rootfs/`) provides the pre-built `main.wasm`
file, passed to as the `cmd` in `Kraftfile`.

Signed-off-by: Razvan Deaconescu <razvand@unikraft.io>

Author: razvand

library/wamrbc762f/Kraftfile

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+spec: v0.6
+
+name: wamr
+
+rootfs: ./rootfs
+
+cmd: ["/main.wasm"]
+
+unikraft:
+  version: stable
+  kconfig:
+    CONFIG_LIBRAMFS: 'y'
+    CONFIG_LIBUK9P: 'y'
+    CONFIG_LIBUKBUS: 'y'
+    CONFIG_LIBUKCPIO: 'y'
+    CONFIG_LIBUKDEBUG_ANSI_COLOR: 'y'
+    CONFIG_LIBUKLIBPARAM: 'y'
+    CONFIG_LIBVFSCORE_AUTOMOUNT_ROOTFS: 'y'
+    CONFIG_LIBVFSCORE_FSTAB: 'y'
+    CONFIG_LIBVFSCORE_ROOTFS_INITRD: 'y'
+
+targets:
+- qemu/x86_64
+- qemu/arm64
+- fc/x86_64
+- fc/arm64
+
+libraries:
+  musl: stable
+  lwip: stable
+  wamr: stable

library/wamrbc762f/Makefile.uk

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+$(eval $(call addlib,appmicropython))

library/wamrbc762f/README.md

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+# WAMR (Wasm Micro Runtime) Image
+
+This directory contains the definition for the `unikraft.org/wamr` image.
+
+To run this image, [install Unikraft's companion command-line toolchain `kraft`](https://unikraft.org/docs/cli) and then you can run:
+
+```
+kraft run unikraft.org/wamr:bc762f
+```
+
+Once executed you will get a "Hello, World!" message and one regarding a memory address.
+
+## See also
+
+- [How to run unikernels locally in Unikraft's Documentation](https://unikraft.org/docs/cli/running).