support publishing, reading, proxying with SRT

[aler9]

Fixes #563

TODO

• support publishing with SRT
• support reading with SRT
• support proxying SRT
• support authentication
• test on Windows
• add API
• add tests
• update README

How to use

publish:

srt://localhost:8890?streamid=publish:path_name:user:pass&pkt_size=1316

read:

srt://localhost:8890?streamid=read:path_name:user:pass

proxy:

paths:
  mystream:
    source: srt://ip-of-camera:port?pkt_size=1316

[codecov]

Codecov Report

Merging #2068 (1c71ba5) into main (d696a78) will decrease coverage by 0.50%.
The diff coverage is 55.70%.

@@            Coverage Diff             @@
##             main    #2068      +/-   ##
==========================================
- Coverage   62.37%   61.88%   -0.50%     
==========================================
  Files         104      108       +4     
  Lines       11372    12422    +1050     
==========================================
+ Hits         7093     7687     +594     
- Misses       3774     4199     +425     
- Partials      505      536      +31     

Files Changed	Coverage Δ
internal/conf/path.go	25.11% <0.00%> (-1.08%)	⬇️
internal/core/authentication.go	81.63% <ø> (ø)
internal/core/rtmp_conn.go	61.18% <0.00%> (-0.12%)	⬇️
internal/core/webrtc_manager.go	62.23% <ø> (ø)
internal/core/srt_conn.go	46.67% <46.67%> (ø)
internal/core/srt_source.go	47.16% <47.16%> (ø)
internal/core/api.go	62.38% <55.55%> (-0.50%)	⬇️
internal/core/srt_listener.go	83.33% <83.33%> (ø)
internal/core/srt_server.go	86.82% <86.82%> (ø)
internal/core/core.go	84.33% <90.00%> (+0.28%)	⬆️
... and 2 more

... and 1 file with indirect coverage changes

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