support reading MP4A-LATM-encoded AAC with RTMP and HLS (#1694)

[aler9]

Fixes #1694

[codecov-commenter]

Codecov Report

Merging #1898 (2ae79e5) into main (91ec498) will decrease coverage by 1.26%.
The diff coverage is 20.11%.

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@@            Coverage Diff             @@
##             main    #1898      +/-   ##
==========================================
- Coverage   62.15%   60.89%   -1.26%     
==========================================
  Files         107      108       +1     
  Lines       11243    11451     +208     
==========================================
- Hits         6988     6973      -15     
- Misses       3743     3959     +216     
- Partials      512      519       +7     

Impacted Files	Coverage Δ
internal/core/hls_source.go	55.78% <0.00%> (ø)
internal/core/udp_source.go	0.00% <0.00%> (ø)
internal/formatprocessor/mpeg2audio.go	0.00% <0.00%> (ø)
internal/formatprocessor/mpeg4audio_generic.go	0.00% <0.00%> (ø)
internal/formatprocessor/mpeg4audio_latm.go	0.00% <0.00%> (ø)
internal/formatprocessor/opus.go	0.00% <0.00%> (ø)
internal/formatprocessor/processor.go	45.45% <0.00%> (-4.55%)	⬇️
internal/formatprocessor/vp8.go	0.00% <0.00%> (ø)
internal/formatprocessor/vp9.go	0.00% <0.00%> (ø)
internal/core/rtmp_conn.go	52.06% <16.36%> (-3.14%)	⬇️
... and 6 more

... and 7 files with indirect coverage changes

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