chore(relayer): add additional test coverage

[cyberhorsey]

This MR enables only subscribing via cli flags, not indexing or processing old blocks, which is very useful for testing locally with the bridge UI in particular.

It also adds some interface separation to the various services, mocks for those, and bumps test coverage quite a bit in the process.

[vercel]

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1 Ignored Deployment

Name	Status	Preview	Updated
website	⬜️ Ignored (Inspect)		Nov 19, 2022 at 4:34AM (UTC)

[codecov]

Codecov Report

Merging #291 (91efdf7) into main (7ad7fdf) will increase coverage by 13.40%.
The diff coverage is 62.50%.

@@             Coverage Diff             @@
##             main     #291       +/-   ##
===========================================
+ Coverage   54.40%   67.80%   +13.40%     
===========================================
  Files          23       23               
  Lines         976      994       +18     
===========================================
+ Hits          531      674      +143     
+ Misses        400      249      -151     
- Partials       45       71       +26     

Flag	Coverage Δ
relayer	67.80% <62.50%> (+13.40%)	⬆️

Impacted Files	Coverage Δ
packages/relayer/cli/cli.go	62.44% <0.00%> (ø)
packages/relayer/indexer/service.go	79.31% <ø> (ø)
packages/relayer/message/processor.go	100.00% <ø> (ø)
packages/relayer/proof/encoded_signal_proof.go	50.00% <ø> (ø)
packages/relayer/proof/types.go	90.00% <ø> (ø)
packages/relayer/indexer/filter_then_subscribe.go	20.00% <50.00%> (+20.00%)	⬆️
packages/relayer/indexer/subscribe.go	86.48% <70.00%> (+86.48%)	⬆️
packages/relayer/indexer/handle_event.go	50.00% <100.00%> (+23.61%)	⬆️
packages/relayer/message/process_message.go	67.54% <100.00%> (+67.54%)	⬆️
... and 3 more

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