feat(Collector): better types for events

[vaporoxx]

Please describe the changes this PR makes and why it should be merged:

This changes the type of the collector event parameters from unknown to something actually helpful.

Status and versioning classification:

• There are no code changes
• I know how to update typings and have done so

[kyranet]

IMO we should declare the names of the constants the same as their types to avoid name conflicts. We can use short names for local non-virtual variables, such as those within an event callback.

Other than this, LGTM.