Cache Bridge instances, remove deprecated code.

[bgrozev]

• fix: Re-use Bridge instances.
• ref: Remove support for calculating stress based on packet rate.

[codecov[bot]]

Codecov Report

Merging #884 (6cd7cad) into master (f14ca1c) will decrease coverage by 0.23%. The diff coverage is 22.72%.

@@             Coverage Diff              @@
##             master     #884      +/-   ##
============================================
- Coverage     44.11%   43.87%   -0.24%     
+ Complexity      802      799       -3     
============================================
  Files           114      114              
  Lines          7619     7608      -11     
  Branches       1062     1062              
============================================
- Hits           3361     3338      -23     
- Misses         3871     3883      +12     
  Partials        387      387              

Impacted Files	Coverage Δ
src/main/java/org/jitsi/jicofo/bridge/Bridge.java	78.64% <0.00%> (-8.52%)	:arrow_down:
...ain/kotlin/org/jitsi/jicofo/bridge/BridgeConfig.kt	91.54% <ø> (-1.14%)	:arrow_down:
...n/kotlin/org/jitsi/jicofo/bridge/BridgeSelector.kt	73.95% <45.45%> (-2.71%)	:arrow_down:

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