chore: EVM swap tx submission and events

[micaelae]

Explanation

• marks swap transactions that go through the BridgeController as swaps
• subscribes to tx confirmations and emits swap metrics

References

Fixes https://consensyssoftware.atlassian.net/browse/MMS-2448

Changelog

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed, highlighting breaking changes as necessary
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes