Support hls subsession, notify start/stop pull hls

[thewind296]

[codecov-commenter]

Codecov Report

Base: 56.43% // Head: 55.55% // Decreases project coverage by -0.88% :warning:

Coverage data is based on head (35b3860) compared to base (548cf87). Patch coverage: 16.14% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #227      +/-   ##
==========================================
- Coverage   56.43%   55.55%   -0.89%     
==========================================
  Files         121      122       +1     
  Lines       10054    10255     +201     
==========================================
+ Hits         5674     5697      +23     
- Misses       3735     3910     +175     
- Partials      645      648       +3     

Impacted Files	Coverage Δ
pkg/base/error.go	0.00% <ø> (ø)
pkg/hls/server_sub_session.go	0.00% <0.00%> (ø)
pkg/logic/config.go	40.15% <ø> (+1.51%)	:arrow_up:
pkg/logic/group__out_sub.go	83.72% <0.00%> (-14.91%)	:arrow_down:
pkg/logic/server_manager__.go	56.26% <4.16%> (-3.24%)	:arrow_down:
pkg/hls/server_handler.go	14.84% <18.26%> (+5.75%)	:arrow_up:
pkg/base/t_unique.go	73.07% <33.33%> (-2.44%)	:arrow_down:
pkg/logic/group__.go	41.17% <65.21%> (+0.52%)	:arrow_up:
pkg/rtprtcp/rtcp_rr_producer.go	27.11% <0.00%> (-3.39%)	:arrow_down:
... and 2 more

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[q191201771]

hey dude, are you still working on it?