feat(Permissions): Add VIEW_GUILD_INSIGHTS

[Khaaz]

Please describe the changes this PR makes and why it should be merged:
This PR adds the VIEW_GUILD_INSIGHTS permissions as documented in discord/discord-api-docs#1421

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.

[SpaceEEC]

I'd wait with merging this PR until the upstream PR was merged, to avoid having a permission alias in case Discord decides to rename it (again).

(It previously appeared under the name VIEW_SERVER_ANALYTICS in the past already for a short amount of time)

[advaith1]

@SpaceEEC upstream PR has been merged

[amishshah]

Upstream has been merged, so merging this PR