feat: Voice Message Sending

[Icebluewolf]

Summary

Adds support for sending voice messages. This includes the waveform and duration_sec parameters that can be used in the new VoiceMessage subclass.
Solves #2575

Resolved, was a py-cord bug: This will be a draft until I have confirmed the behavior of waveforms and duration_sec in interaction responses.
As of now I believe there is a discord bug that causes them to be ignored.
Resolved: Also Pending: DAPI #7158

Information

• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed).
• This PR is not a code change (e.g. documentation, README, typehinting,
  examples, ...).

Checklist

• I have searched the open pull requests for duplicates.
• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• If type: ignore comments were used, a comment is also left explaining why.
• I have updated the changelog to include these changes.

[JustaSqu1d]

Potentially related commit: discord/discord-api-docs@e6cf4a9

[aaronjamt]

DAPI #7158 has been closed and I've been using this PR in a project for a couple weeks now without issues. Is it ready to merge?

[Icebluewolf]

As far as I know this has not been officially added to the API as it is not strictly documented. Also last time I tested it I was having issues getting the waveforms to display on interaction responses.