fix: remove erroneous pyi file messing up client typehints

[AstreaTSS]

Pull Request Type

• Feature addition
• Bugfix
• Documentation update
• Code refactor
• Tests improvement
• CI/CD pipeline enhancement
• Other: [Replace with a description]

Description

This PR is the same issue of #1748, but fixes the issue library-wide instead of just for extensions.

To recap: using client: Client as a class variable for classes resulted in the client being of type Unknown to Pyright thanks to a "class cannot derive from itself" issue.

Eventually, I narrowed down the issue to _template.pyi which made EventMixinTemplate, the class used in all processors and so in Client, inherit from Client, causing a self-derivative.

The file as a whole was added in 2022, evidentially to make type hinting better when using EventMixinTemplate. While it would be nice to keep these typehints, this PR removes the pyi file instead and adjusts some of the code so that what is currently there is typehinted enough for convenience.

Changes

• Remove _template.pyi.
• Adjust _template.py to add attributes to EventMixinTemplate used in certain places.
• Adjust processors to rely on attributes defined in EventMixinTemplate.

Related Issues

Test Scenarios

import interactions
bot = interactions.Client()
reveal_type(bot.user._client)

Python Compatibility

• I've ensured my code works on Python 3.10.x
• I've ensured my code works on Python 3.11.x

Checklist

• I've run the pre-commit code linter over all edited files
• I've tested my changes on supported Python versions
• I've added tests for my code, if applicable
• I've updated / added documentation, where applicable