feat(relayer): header sync check before processing messages

[cyberhorsey]

closes #422

[codecov]

Codecov Report

Merging #441 (b5bd3ba) into main (a81a052) will increase coverage by 0.00%.
The diff coverage is 75.34%.

@@           Coverage Diff           @@
##             main     #441   +/-   ##
=======================================
  Coverage   65.42%   65.43%           
=======================================
  Files          99      100    +1     
  Lines        2661     2699   +38     
  Branches      313      313           
=======================================
+ Hits         1741     1766   +25     
- Misses        850      861   +11     
- Partials       70       72    +2     

Flag	Coverage Δ		*Carryforward flag
bridge-ui	100.00% <ø> (ø)		Carriedforward from 89e417d
protocol	58.25% <ø> (ø)		Carriedforward from 89e417d
relayer	69.03% <75.34%> (-0.12%)	⬇️
ui	100.00% <ø> (ø)		Carriedforward from 89e417d

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

Impacted Files	Coverage Δ
packages/relayer/message/process_message.go	62.92% <25.00%> (+1.12%)	⬆️
packages/relayer/indexer/subscribe.go	79.16% <50.00%> (-3.60%)	⬇️
packages/relayer/message/wait_header_synced.go	60.00% <60.00%> (ø)
packages/relayer/cli/cli.go	62.44% <100.00%> (+0.94%)	⬆️
packages/relayer/indexer/service.go	75.53% <100.00%> (+0.26%)	⬆️
packages/relayer/message/processor.go	100.00% <100.00%> (ø)
packages/relayer/message/wait_for_confirmations.go	80.00% <100.00%> (ø)

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