Multi-Chain RPC Proxy w/ Retries

[trajan0x]

Description

Fixes #135 (except integration w/ #114)

[codecov]

Codecov Report

Merging #136 (6cd0bd1) into master (5e4668d) will increase coverage by 0.40309%.
The diff coverage is 30.86957%.

@@                 Coverage Diff                 @@
##              master        #136         +/-   ##
===================================================
+ Coverage   51.45197%   51.85506%   +0.40308%     
===================================================
  Files            132         137          +5     
  Lines           5372        5768        +396     
  Branches          73          73                 
===================================================
+ Hits            2764        2991        +227     
- Misses          2337        2495        +158     
- Partials         271         282         +11     

Impacted Files	Coverage Δ
services/omnirpc/proxy/server.go	0.00000% <0.00000%> (ø)
services/omnirpc/proxy/servereq.go	0.00000% <0.00000%> (ø)
services/omnirpc/rpcmap/rpcmap.go	51.40187% <51.40187%> (ø)
services/omnirpc/config/config.go	68.42105% <68.42105%> (ø)
services/omnirpc/latency/latency.go	66.66667% <100.00000%> (ø)
agents/testutil/typecast.go	92.85714% <0.00000%> (-7.14286%)	⬇️
scribe/db/datastore/sql/base/transaction.go	0.00000% <0.00000%> (ø)
scribe/backfill/filter.go	64.19753% <0.00000%> (ø)
scribe/backfill/contract.go	80.26316% <0.00000%> (ø)
ethergo/signer/signer/kmssigner/signing.go	42.39130% <0.00000%> (+3.26087%)	⬆️
... and 3 more

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