Add support for custom bakes to databake

[sffc]

#2452

[gemini-code-assist]

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[sffc]

Things I'd like feedback on:

1. Names of things
2. The two traits (safe and unsafe) and how they do/don't interact with each other
3. The unusual safety requirement on the unsafe trait
4. The new overload on the macro and whether it has any risk of being a breaking change

[robertbastian]

I think having a trait for this is overkill if you can provide a method to the macro

[sffc]

Reasons I made it a trait:

1. Gives a place to enforce the strange safety requirement in the unsafe version
2. And since we have it for unsafe, we can also use it for safe

How do you suggest handling the safety requirement without a trait?

[robertbastian]

Suggested change

	/// #[databake(path = custom_bake)]
	/// #[databake(custom_bake = Self::bake_to_bytes)]