feat: add additional webhook functions

[mAxYoLo01]

Pull Request Type

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

Description

Adds Guild.fetch_all_webhooks(), as requested on support server

Changes

Related Issues

Test Scenarios

@interactions.slash_command(name="test")
async def test(ctx: interactions.SlashContext):
    webhooks = await ctx.guild.fetch_all_webhooks()
    for webhook in webhooks:
        print(webhook.name)

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