refactor(GuildChannel): rework setting parent and permission locking

[almostSouji]

Please describe the changes this PR makes and why it should be merged:

• 🌊 upstream: DAPI documentation lock_permissions, set_parent in (chore: document missing properties in Modify Channel Positions endpoint discord/discord-api-docs#1776)
• 🌊 upstream: DAPI feature request lock_permissions in PATCH/channels/{channel.id} (Request: Add lock_permissions to PATCH/channels/{channel.id} discord/discord-api-docs#3264)
• ✏ draft: subject to change

---

After some more digging brought up after #4144 this has turned out to be much more of an issue and less of an easy fix as originally assumed. I'll submit this as a draft PR so it can be referenced.

⚠This PR will be subject to heavy changes as more information is acquired!

Current checklist/required information:

• Make #setChannelPositions accept parent and lock options
• Figure out how to efficiently set role data for all necessary roles when positions or parent properties are modified
• use modify channel positions endpoint for #setParent and permission locking
• use modify channel positions endpoint for Role#setPosition
• use modify channel positions endpoint for Role#edit, if a position is modified
• 🌊 DAPI documentation lock_permissions in above endpoint (chore: document missing properties in Modify Channel Positions endpoint discord/discord-api-docs#1776)
• 🌊 DAPI documentation set_parent in above endpoint (chore: document missing properties in Modify Channel Positions endpoint discord/discord-api-docs#1776)
• 🌊 DAPI feature lock_permissions in PATCH/channels/{channel.id} (Request: Add lock_permissions to PATCH/channels/{channel.id} discord/discord-api-docs#1796)

Changes:

• Guild#setChannelPositions allow and properly handle parent and lock options
• Guild#setChannelPositions make position optional (while this could be argued as major, it really just fixes the behavior to reflect the actual behavior of the API)

Alternatives:

• split #setChannelPositions support into own PR
• split #setParent allowing overwrites into own PR, should Request: Add lock_permissions to PATCH/channels/{channel.id} discord/discord-api-docs#1796 be granted

Original Issue

The original hacky fix has been moved into #4627 to allow acting faster than the above linked documentation request, should the need arise.

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.

[almostSouji]

serves more as a note than as a draft, hence converting to issue #6090