Evaluate the possibility of using a OnceMap instead of an AppendOnlyVec for TypeDatas.

[github-actions]

The only reason we would use a `OnceMap` would be to improve the lookup performance and avoid having to iterate over the entire vec each time we need to find a type data with a particular schema. Since there are not usually a large number of type datas for any single type, this probably isn't a concern, but maybe we should do some benchmarking.

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bones/framework_crates/bones_schema/src/alloc/type_datas.rs

Lines 8 to 15 in b865f8f

	/// This structure doesn't require a mutable reference to insert records
	#[derive(Debug)]
	// TODO: Evaluate the possibility of using a `OnceMap` instead of an `AppendOnlyVec` for `TypeDatas`.
	// The only reason we would use a `OnceMap` would be to improve the lookup performance and avoid
	// having to iterate over the entire vec each time we need to find a type data with a particular
	// schema. Since there are not usually a large number of type datas for any single type, this
	// probably isn't a concern, but maybe we should do some benchmarking.
	pub struct TypeDatas(AppendOnlyVec<SchemaBox>);

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This issue was generated by todo-issue based on a TODO comment in b865f8f.