Keep event history in circular buffer

[gammazero]

Event history stored in circular buffer

Description, Motivation and Context

Storing event history in a circular buffer avoids memory allocation after the storage limit is reached.

• Minor fixes to storage history logic, such as checking result of type assertion.
• Order message type switch to check for most common messages first
• Minor code improvements

What is the current behavior?

When event history limit is reached, the beginning of the history entries slice is ignored: entries = entries[1:]

What is the new behavior?

A circular buffer is used instead to store event history.

What kind of change does this PR introduce?

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• I have added tests to cover my changes.
• Overall test coverage is not decreased.
• All new and existing tests passed.
• My change requires a change to the documentation.
  • I have updated the documentation accordingly.