feat(ClientEvents): add tuple labels to event arguments

[ElCholoGamer]

Adds labels to the tuple types in the ClientEvents interface (typings). These labels will appear as argument names when using IntelliSense, instead of 'args_0', 'args_1', etc. They will be helpful for knowing exactly what each argument represents, mostly in update events (which pass the 'old' and 'new' version of the object), and shard events (which pass the shard ID).

Although most labels are self-explanatory, some other may need slight changes to be more accurate.

Status

• Code changes have been tested against the Discord API, or there are no code changes
• I know how to update typings and have done so, or typings don't need updating

Semantic versioning classification:

• This PR changes the library's interface (methods or parameters added)
  • This PR includes breaking changes (methods removed or renamed, parameters moved or removed)
• This PR only includes non-code changes, like changes to documentation, README, etc.