refactor(protocol): remove internal variables and functions

[1xDeFi]

Removed from: https://taiko.xyz/docs/reference/smart-contracts/bridge/BridgedERC20

[vercel]

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[dionysuzx]

hello @1xDeFi thanks for your contribution. could you merge the other PRs and this all into one? (related to removing internal variables and functions).

But before that i'll mention: this change might work in the short term, but once we autogenerate the documentation again (which will happen on build from compiling the solidity code), this will get overwritten and we would need to manually remove it again.

So we should probably think of a dynamic way to do this. One thing to look into is how the documentation is generated from handlebars templates. see: https://github.com/taikoxyz/taiko-mono/blob/main/packages/protocol/solidity-docgen/templates/README.md

[codecov]

Codecov Report

Merging #419 (831c156) into main (a81a052) will increase coverage by 0.07%.
The diff coverage is 77.77%.

❗ Current head 831c156 differs from pull request most recent head 917cd97. Consider uploading reports for the commit 917cd97 to get more accurate results

@@            Coverage Diff             @@
##             main     #419      +/-   ##
==========================================
+ Coverage   65.42%   65.50%   +0.07%     
==========================================
  Files          99       99              
  Lines        2661     2661              
  Branches      313      313              
==========================================
+ Hits         1741     1743       +2     
+ Misses        850      848       -2     
  Partials       70       70              

Flag	Coverage Δ		*Carryforward flag
bridge-ui	100.00% <ø> (ø)		Carriedforward from e7ef53e
protocol	58.54% <ø> (+0.28%)	⬆️	Carriedforward from e7ef53e
relayer	68.96% <77.77%> (-0.19%)	⬇️
ui	100.00% <ø> (ø)		Carriedforward from e7ef53e

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

Impacted Files	Coverage Δ
packages/relayer/repo/event.go	72.72% <55.55%> (ø)
packages/relayer/cli/cli.go	61.50% <60.00%> (ø)
packages/relayer/message/process_message.go	61.79% <62.50%> (ø)
packages/relayer/message/get_latest_nonce.go	72.72% <72.72%> (ø)
packages/relayer/message/is_profitable.go	76.00% <76.00%> (ø)
packages/relayer/message/wait_for_confirmations.go	80.00% <80.00%> (ø)
packages/relayer/indexer/filter_then_subscribe.go	23.52% <85.71%> (ø)
packages/relayer/http/get_events_by_address.go	88.00% <100.00%> (ø)
packages/relayer/indexer/service.go	75.26% <100.00%> (ø)
packages/relayer/message/processor.go	100.00% <100.00%> (ø)
... and 10 more

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[dionysuzx]

Approved, thanks for the contribution!