fix(ampd): skip events from unknown contracts

[cjcobb23]

The handlers currently return an error when encountering an event with the same event_type as what they are looking for, but with different fields. This can happen due to contract upgrades, but also if any random contract emits an event with the same event_type as the event the handler cares about. This can cause either crashing the process, or unnecessary retries (and waiting).

This PR makes a change so that the handlers first check the "_contract_address" field of the event, and simply skip the event (returning Ok(()) ) if the address doesn't match the contract address for which the handler is configured to handle events.

https://axelarnetwork.atlassian.net/browse/AXE-3080

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (69e7bf0) 89.72% compared to head (6f64cae) 89.77%.

Files	Patch %	Lines
ampd/src/handlers/multisig.rs	96.92%	2 Missing ⚠️
ampd/src/handlers/evm_verify_msg.rs	66.66%	1 Missing ⚠️
ampd/src/handlers/evm_verify_worker_set.rs	66.66%	1 Missing ⚠️
ampd/src/handlers/sui_verify_worker_set.rs	66.66%	1 Missing ⚠️
packages/events/src/event.rs	98.46%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #259      +/-   ##
==========================================
+ Coverage   89.72%   89.77%   +0.04%     
==========================================
  Files         161      161              
  Lines       16653    16765     +112     
==========================================
+ Hits        14942    15050     +108     
- Misses       1711     1715       +4     

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