In raw msgpack rebased

[RomanPryamonosov]

Please review the following files:

Backend for Fluent Bit exporter

plugins/in_raw_msgpack/CMakeLists.txt
plugins/in_raw_msgpack/in_raw_msgpack.c
plugins/in_raw_msgpack/in_raw_msgpack.h

src/raw_msgpack_api/CMakeLists.txt
src/raw_msgpack_api/raw_msgpack_api.c

Backend for Fluent Aggregator:

plugins/out_collectx/CMakeLists.txt 
plugins/out_collectx/collectx.c
plugins/out_collectx/collectx.h

src/collectx_plugin_api/collectx_plugin_api.c
src/collectx_plugin_api/CMakeLists.txt

Custom output plugin:

plugins/out_stdout_raw/CMakeLists.txt
plugins/out_stdout_raw/stdout_raw.c
plugins/out_stdout_raw/stdout_raw.h

The rest files are not important for review

To remove:

examples/raw_msgpack_api

[github-actions]

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