Add PluralKit style command (limited) handler an proxy recognition

[dozro]

Description

Fixes #427
Fixes #425 (you can use shorthands, instead of /usepmp)

PluralKit Compatibility and Per-Message Profile Enhancements

• Added limited compatibility for PluralKit-style (pk;member) commands, allowing users to interact with PMPs using familiar PK syntax.
• Introduced shorthand syntax for sending messages with a Persona, such as ✨:test, and an option to enable/disable this in settings.
• Added a new settings section (PKCompatSettings) in the Persona profile page to toggle PK command compatibility and shorthand proxying.

Command Handling Improvements

• Updated /addpmp and /usepmp command parsing to use regular expressions, fixing syntax issues and clarifying usage. The /usepmp command now has a new syntax and properly resets room associations when requested.
• Added a new /pmpproxy command to associate a proxy with a profile, and integrated feedback for unsupported flags in /usepmp.

Data Model and Utility Updates

• Expanded the per-message profile data model to support compatibility versions and proxy associations, including new type definitions and parsing utilities.

These changes collectively improve the user experience for those using per-message profiles and PluralKit-style workflows, and provide more flexible and robust command handling.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

AI disclosure:

• Partially AI assisted (clarify which code was AI assisted and briefly explain what it does).
• Fully AI generated (explain what all the generated code does in moderate detail).

no AI was used in the creation of this PR

[dozro]

.changeset/fix_command_handling_for_usepmp.md and .changeset/fix_pmp_commands.md are maybe the same content just different phrasing 🤔

[7w1]

Didn’t test heavily but code lgtm