feat: Current Member Edit now supports banner, avatar and bio

[Jaskowicz1]

This PR allows bots to edit their banner, avatar and bio, per guild.

Code change checklist

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

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[Jaskowicz1]

This needs #1503 merged and then coro needs to be auto generated.

[Jaskowicz1]

This needs testing in a bot before we go ahead with marking as Ready for Review

[Jaskowicz1]

This is working!

Here is my test bot before:

Here is only with name and bio set:

Here is with name, avatar, banner, bio:

It does also reset when you pass a blank string to all fields.

[Jaskowicz1]

PR has now been marked as ready for review

[Mishura4]

I have minor changes to request and I can't do it on mobile, blocking this until tomorrow 😈

[Mishura4]

Suggested change

	const std::string post_data = j.dump(-1, ' ', false, json::error_handler_t::replace);
	rest_request<confirmation>(this, API_PATH "/guilds", std::to_string(guild_id), "members/@me", m_patch, std::move(post_data), std::move(callback));
	std::string post_data = j.dump(-1, ' ', false, json::error_handler_t::replace);
	rest_request<confirmation>(this, API_PATH "/guilds", std::to_string(guild_id), "members/@me", m_patch, std::move(post_data), std::move(callback));

You have to remove the const too, moving a const object just copies