Add internal support for @discordjs/opus to v11

[amishshah]

Please describe the changes this PR makes and why it should be merged:
Adds support for @discordjs/opus, a performant alternative to node-opus with better audio quality.

To-do:

• Update code to work with @discordjs/opus
• Update documentation to reflect the preference of @discordjs/opus

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.