feat(coro): coro 2.0

[Mishura4]

This is a massive PR that fundamentally changes the coro implementation, everything is a derivative of dpp::awaitable and dpp::promise now. This helps with de-duplicating a lot of coro-related code, making it easier to maintain, and offers a way to add things to all of the coroutine types at once, for example the sync_wait method available on all awaitable types, which can help for example with starting a coroutine from a non-coroutine.

Still missing some documentation & polishing

Code change checklist

• [ ] I have ensured that all methods and functions are fully documented using doxygen style comments.
• [x] My code follows the coding style guide.
• [x] I tested that my change works before raising the PR.
• [x] I have ensured that I did not break any existing API calls.
• [x] I have not built my pull request using AI, a static analysis tool or similar without any human oversight.

[CLAassistant]

All committers have signed the CLA.

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[Jaskowicz1]

This is huge, god damn.

I'll pull this branch locally and test this with my bot, will give you a shout on Discord if I have any issues!

[braindigitalis]

lgtm, will test it out when its in dev as the coro features in my bot arent complete so i can't test this thoroughly.

[Mishura4]

Closing to reopen from https://github.com/brainboxdotcc/DPP/tree/coro