Add more candidate pair and transport stats

[mickel8]

Add more candidate pair and transport stats.

[codecov]

Codecov Report

Attention: Patch coverage is 74.11765% with 22 lines in your changes missing coverage. Please review.

Project coverage is 83.83%. Comparing base (334ba47) to head (3a784c0).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/ex_ice/priv/ice_agent.ex	69.86%	22 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #75      +/-   ##
==========================================
- Coverage   84.29%   83.83%   -0.47%     
==========================================
  Files          25       25              
  Lines        1783     1837      +54     
==========================================
+ Hits         1503     1540      +37     
- Misses        280      297      +17     

Files with missing lines	Coverage Δ
lib/ex_ice/priv/candidate_pair.ex	50.00% <ø> (ø)
lib/ex_ice/priv/conn_check_handler/controlled.ex	94.11% <100.00%> (+0.24%)	⬆️
lib/ex_ice/priv/conn_check_handler/controlling.ex	87.14% <100.00%> (+0.77%)	⬆️
lib/ex_ice/priv/ice_agent.ex	86.08% <69.86%> (-0.98%)	⬇️

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