[consensus/authority] Add fetch rate limiting

[patrick-ogrady]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 79.36508% with 13 lines in your changes missing coverage. Please review.

Project coverage is 92.11%. Comparing base (c86abd5) to head (83e9fe6).
Report is 1 commits behind head on commonware-consensus.

Files with missing lines	Patch %	Lines
consensus/src/authority/actors/resolver/actor.rs	75.00%	12 Missing ⚠️
consensus/src/mocks/application.rs	66.66%	1 Missing ⚠️

@@                   Coverage Diff                    @@
##           commonware-consensus     #136      +/-   ##
========================================================
- Coverage                 92.17%   92.11%   -0.07%     
========================================================
  Files                        60       60              
  Lines                     12952    13008      +56     
========================================================
+ Hits                      11939    11982      +43     
- Misses                     1013     1026      +13     

Files with missing lines	Coverage Δ
consensus/src/authority/engine.rs	91.35% <100.00%> (+0.10%)	⬆️
consensus/src/authority/mod.rs	96.35% <100.00%> (+0.02%)	⬆️
consensus/src/mocks/application.rs	97.29% <66.66%> (+0.12%)	⬆️
consensus/src/authority/actors/resolver/actor.rs	84.99% <75.00%> (-0.77%)	⬇️

... and 2 files with indirect coverage changes

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