[RSDK-8312] Collect and send API and SDK version in metadata

[njooma]

The Java version. How it works:

1. update-protos workflow writes the tag version to api_version.lock
2. Makefile looks at api_version.lock when generating API protos
3. build.gradle in the root project reads the api_version.lock and sets a variable on the subprojects named api_version
4. build.gradle in the sdk/core subproject reads the version and api_version variables (set by the root project) and writes to a file called VersionInfo.kt
5. In sdk/core, there's a file called Metadata.kt that reads the values set in VersionInfo.kt and sets them in a static VERSION_METADATA object
6. In sdk/core, two channels are updated: the BasicManagedChannel and the ClientStream to set the metadata properly
   • BasicManagedChannel is used for direct gRPC connections
   • ClientStream is used in webRTC connections

Here's how it looks: