Implement async with x operations for discord.ext.ipcx.Client

[No767]

Summary

This PR implements the async with x operations for discord.ext.ipcx.Client. This would make it easier and more modern in order to start up the client, and is designed to be used with FastAPI's lifespan events. This also work with other frameworks that do something similar

Types of changes

What types of changes does your code introduce to discord-ext-ipcx?
Put an x in the boxes that apply

• Bugfix (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)
• Documentation Update (Updates to README.md, the documentation, etc)
• Other (if none of the other choices apply)

Checklist

Put an x in the boxes that apply

• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes. (if appropriate)
• All workflows pass with my new changes
• I have generated news fragments for this PR. (if appropriate, format is {#PR}.type.md)
• This PR does not address a duplicate issue or PR