Add fragmentmetadata to the kvsappcli application, CI, fix build and runtime issues for Mac

[sirknightj]

Issue #, if available:

• Resolves support mkv tags #87
• Continuation of adding initial fragment metadata tags #89

Description of changes:

• Add fragment metadata to the kvsappcli application.
  • Add the metadata that should be added for every fragment to KvsApp struct.
• Optimization: Reduce the size fields for the tag headers, since there is are length restrictions for tags in KVS https://docs.aws.amazon.com/kinesisvideostreams/latest/dg/limits.html#limits-streaming-metadata, 8 bytes for each is not necessary.
• Fix build and runtime issues with kvsappcli application so it builds out of the box for Mac.
• Add CI to build and run kvsappcli for a short time, verify clean exit, and verify fragment metadata was added.
• Add mkv dump featury for debugging parity. https://github.com/awslabs/amazon-kinesis-video-streams-producer-c/blob/5fb356e484d734ce3650c751a4469985c488bc1f/src/source/Response.c#L38-L46. It will save the MKV it would have sent to KVS to the file.
• Print out the endpoint that it tries to control plane endpoint it connects to (in case AWS_KVS_HOST is not set, region mismatch)
• Print out the stream name it tries to use

Build issues addressed

1. Add a patch to address const compile issue in media interface

Runtime issues addressed

1. Fix a segfault during cleanup path due to double-free caused by the wrong thread id being shutdown (video thread twice).
2. Fix occasional segfault due to string out of bounds issue in fragment ack parser.

I encountered one additional issue where when building for Release, it won't connect due to SSL verification error. The current workaround I'm using is to build with Debug. I observed disabling the compiler optimizations works as well, though not ideal.

set(CMAKE_C_FLAGS_RELEASE "-O0")  # Disable optimization in Release mode

Testing

• New Github actions CI (automatic)
• Ran CLI application (manually) on Mac
• Manually checked tags are there with GetMedia and with local mkv dump
• Ran on AMB82-Mini and checked playback in KVS console. I'll look into adding instructions for that in the future seeing Will it work on ameba Pro 2 mini #86.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[sirknightj]

Note for reviewers - this section, I wanted to add these two log lines:

LogInfo("Making describe request to: %s", pServPara->pcHost);
LogInfo("Stream name: %s", pDescPara->pcStreamName);

But, LogInfo doesn't return anything, so I couldn't put it in the condition. Therefore, I moved it to the else and moved the rest of the conditions into the else as well (indent).

[sirknightj]

Here is the change. The rest of this section remains untouched.