ID3v2: Enforce tag restrictions

[Serial-ATA]

ID3v2 lets you define tag restrictions in the extended header, which we can already read/write: https://github.com/Serial-ATA/lofty-rs/blob/8625a129569e9848e4b37800406da391ea79ef49/lofty/src/id3/v2/restrictions.rs

But they aren't enforced when writing a tag.

Does anyone actually use this feature? As with most things in ID3v2, probably not. But it could be neat.

This would be an optional toggle in WriteOptions that would be off by default.