feat: role.move function

[Wolfhound905]

What type of pull request is this?

• [ ] Non-breaking code change
• [x] Breaking code change
• [ ] Documentation change/addition
• [ ] Tests change
• [ ] CI change
• [ ] Other: [Replace with a description]

Description

The library is currently lacking an intuitive way to move a role's position.

Changes

• modify_guild_role_positions() now takes a list. This reflects how the API handles position changes.
• models.Role now has the move() function

Test Scenario(s)

from naff.client import Client
from naff import listen

bot = Client(debug_scope=<guild_id>)

@listen()
async def on_startup():
    print("Bot is ready!")
    guild = await bot.fetch_guild(<guild_id>)
    role = await guild.fetch_role(<role_id>)
    await role.move(len(guild.roles) - 2) # Moving the role 2 from top role (@@everyone)

bot.start("token")

Checklist

• [x] I've formatted my code with Black
• [x] I've added docstrings to everything I've touched
• [x] I've ensured my code works on Python 3.10.x
• [ ] I've ensured my code works on Python 3.11.x
• [x] I've tested my changes
• [ ] I've added tests for my code - if applicable
• [ ] I've updated the documentation - if applicable