[order-watcher] Public function getStats

[amaurer]

Description

Added public function to get order watcher counts so I can effectively scale order watcher instances based on watch loads.

Testing instructions

Function added to test suite, no real changes as it reads in internal property that is assumed properly maintained.

Types of changes

Added function for getWatchCounts in order watcher and one test.

Checklist:

• Prefix PR title with [WIP] if necessary.
• Prefix PR title with bracketed package name(s) corresponding to the changed package(s). For example: [sol-cov] Fixed bug.
• Add tests to cover changes as needed.
• Update documentation as needed.
• Add new entries to the relevant CHANGELOG.jsons.

[fabioberger]

Thanks a lot for this @amaurer! Do you think there might be additional stats we'd want to track in the future? Trying to decide if we want to make this a more generic getStats method that initially returns orderCount but could eventually return additional stats.

[amaurer]

That makes sense so that, it is expandable and won't break interfaces in consuming applications. Changed to getStats which returns a Stats object with orderCount as a property. @fabioberger

[fabioberger]

Thanks for changing that @amaurer! Looks good, just minor fixes then we can merge and publish.

[fabioberger]

Also, could you run yarn prettier from the monorepo root, as well as yarn lint?

[fabioberger]

@amaurer thanks for addressing my comments. Can you also export Stats in the index.ts file?

Once this is done and the conflicts are resolved, I'll approve & merge.