[RTC-308] Make simulcast configurable

[sgfn]

ref:

• https://github.com/jellyfish-dev/elixir_server_sdk/pull/27
• https://github.com/jellyfish-dev/jellyfish-docs/pull/18

[codecov[bot]]

Codecov Report

Merging #68 (2271cdc) into main (e2fdff7) will decrease coverage by 0.43%. The diff coverage is 84.37%.

@@            Coverage Diff             @@
##             main      #68      +/-   ##
==========================================
- Coverage   84.02%   83.59%   -0.43%     
==========================================
  Files          35       36       +1     
  Lines         507      512       +5     
==========================================
+ Hits          426      428       +2     
- Misses         81       84       +3     

Files Changed	Coverage Δ
lib/jellyfish/peer.ex	85.71% <50.00%> (-14.29%)	:arrow_down:
lib/jellyfish/peer/webrtc.ex	46.42% <80.00%> (+0.27%)	:arrow_up:
lib/jellyfish/room.ex	83.03% <88.88%> (-0.90%)	:arrow_down:
lib/jellyfish_web/api_spec/peer.ex	100.00% <100.00%> (ø)
lib/jellyfish_web/api_spec/peer/webrtc.ex	100.00% <100.00%> (ø)
.../jellyfish_web/controllers/component_controller.ex	100.00% <100.00%> (ø)
lib/jellyfish_web/controllers/peer_controller.ex	100.00% <100.00%> (ø)

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