refactor/test: LP events for data integration

[p0mvn]

Closes: https://app.clickup.com/t/860q8rpw7

What is the purpose of the change

This change ensures that LP events contain all of the necessary attributes needed by the data team.

It moves the LP events on the keeper layer in case createPosition and withdrawPosition methods are called outside of the message server in the future.

Brief Changelog

• ensure all required attributes are present
• move event emission to the keeper layer
• encapsulate common logic into a function
• basic test that events are emitted correctly.

Testing and Verifying

This change added tests

Documentation and Release Note

• Does this pull request introduce a new feature or user-facing behavior changes? no
• Is a relevant changelog entry added to the Unreleased section in CHANGELOG.md? no
• How is the feature or change documented? not applicable

[mattverse]

LGTM