feat(channel): implement voice channel statuses

[shiftinv]

Summary

Adds support for retrieving + editing a voice channel's status, which is sort of an ephemeral description set by users.

status being ephemeral is also the reason it's only available via the gateway, not REST; this PR makes use of the somewhat undocumented status field in the channels we already receive from the gw anyway.

Fetching a voice channel's start time isn't implemented here, since it's a whole lot of complexity (see 9e522a9 as an example) for a single field with barely any use. Changes are available through on_voice_channel_start_time_update nonetheless. c:

discord/discord-api-docs@258deb4

Based on @Snipy7374's previous work in #1206.

Checklist

• If code changes were made, then they have been tested
  • I have updated the documentation to reflect the changes
  • I have formatted the code properly by running uv run nox -s lint
  • I have type-checked the code by running uv run nox -s pyright
• 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, ...)

[read-the-docs-community]

Documentation build overview

📚 disnake | 🛠️ Build #32828585 | 📁 Comparing 45f5dd7 against latest (2d520ba)

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• faq.html
• genindex.html
• index.html
• whats_new.html
• api/abc.html
• api/activities.html
• api/app_commands.html
• api/app_info.html
• api/audit_logs.html
• api/automod.html
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