feat: add support for MPEG-TS over unix

[jean343]

fixes: #4388

For testing

Settings:

paths:
  ffmpeg:
    source: unix:/tmp/ffmpeg.socket

Populate unix socket:

ffmpeg -re -f lavfi -i testsrc=size=1280x720:rate=30 \
-c:v libx264 -pix_fmt yuv420p -preset ultrafast -b:v 600k \
-f mpegts "unix:/tmp/ffmpeg.socket"

Play the video:

ffplay -i rtsp://localhost:8554/ffmpeg

[codecov]

Codecov Report

Attention: Patch coverage is 54.00000% with 46 lines in your changes missing coverage. Please review.

Project coverage is 57.22%. Comparing base (edbdd34) to head (01bc131).

Files with missing lines	Patch %	Lines
internal/staticsources/unix/source.go	60.00%	28 Missing and 8 partials ⚠️
internal/conf/path.go	0.00%	5 Missing ⚠️
internal/core/static_source_handler.go	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4389      +/-   ##
==========================================
- Coverage   57.23%   57.22%   -0.02%     
==========================================
  Files         204      205       +1     
  Lines       20855    20955     +100     
==========================================
+ Hits        11936    11991      +55     
- Misses       8012     8049      +37     
- Partials      907      915       +8     

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