feat: add an ignored token list

[colinlyguo]

Purpose or design rationale of this PR

feature:

1. only ignoring transfer events for now (minimum alert changes).
2. still sending an alert, with a "token ignored" flag for easier check.

TODOs:

• Local syncing.
• Testing the regression bad case.

PR title

Your PR title must follow conventional commits (as we are doing squash merge for each PR), so it must start with one of the following types:

• feat: A new feature

Deployment tag versioning

Has tag in common/version.go been updated or have you added bump-version label to this PR?

• Yes

Breaking change label

Does this PR have the breaking-change label?

• No, this PR is not a breaking change

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 40.82%. Comparing base (70a1d98) to head (66dd928).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #121   +/-   ##
=======================================
  Coverage   40.82%   40.82%           
=======================================
  Files           5        5           
  Lines         605      605           
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  Hits          247      247           
  Misses        349      349           
  Partials        9        9           

Flag	Coverage Δ
chain-monitor	40.82% <ø> (ø)

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[colinlyguo]

testing result, can trigger the alarm and continue:

:bangbang: Gateway event and transfer event check failed
• token type: TokenTypeERC20
• layer type: Layer1
• event type: EventTypeUnknown
• block number: 20240334
• tx_hash: 0x275af83a9d9f1acdaa726b564a0852cc6c81f87cdf51efa9ac12c6ccb12a39e0
• msg_hash: 0x0000000000000000000000000000000000000000000000000000000000000000
• transfer balance: -30606497
• gateway balance: <nil>
• token address: 0x70fDD35857f4A765C1416ABa83ed5B19e49F27b9
• token ignored: true
• err info:the gateway event associated with the transfer event does not exist