feat(relayer): Relayer proof flag for supporting RLP encoding proof or not

[cyberhorsey]

Note that after alpha-6 is deprecated, all RLPEncoding code will be removed, and so will the flag, since we will only have one encoding style.

This is simply to support both types of Bridges, so we can perform an upgrade of the SignalService while testing.

[vercel]

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Name	Status	Preview	Updated (UTC)
bridge-ui-v2-a6	✅ Ready (Inspect)	Visit Preview	Feb 6, 2024 3:24am

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (alpha-7@ab82ffb). Click here to learn what that means.

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Additional details and impacted files

@@            Coverage Diff             @@
##             alpha-7   #15640   +/-   ##
==========================================
  Coverage           ?   26.71%           
==========================================
  Files              ?      102           
  Lines              ?     6259           
  Branches           ?        0           
==========================================
  Hits               ?     1672           
  Misses             ?     4404           
  Partials           ?      183           

Flag	Coverage Δ		*Carryforward flag
eventindexer	17.28% <0.00%> (?)		Carriedforward from 739a268
guardian-prover-health-check	36.13% <0.00%> (?)		Carriedforward from 739a268
relayer	36.35% <0.00%> (?)

*This pull request uses carry forward flags. Click here to find out more.

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