Separate app-manager and app-framework from WAMR (#3129)

As planned, the app-manager and app-framework are to be migrated to
https://github.com/bytecodealliance/wamr-app-framework.

ps.
https://github.com/bytecodealliance/wasm-micro-runtime/issues/2329
https://github.com/bytecodealliance/wasm-micro-runtime/wiki/TSC-meeting-notes

.github/workflows/compilation_on_nuttx.yml

@@ -19,7 +19,6 @@ on:
       - "!samples/workload/**"
       - "tests/wamr-test-suites/**"
       - "wamr-compiler/**"
-      - "wamr-sdk/**"
   # will be triggered on push events
   push:
     branches:
@@ -35,7 +34,6 @@ on:
       - "!samples/workload/**"
       - "tests/wamr-test-suites/**"
       - "wamr-compiler/**"
-      - "wamr-sdk/**"
   # allow to be triggered manually
   workflow_dispatch: