Mechanism for movies to include initram state

Just riffing here: If there was something like

public interface IInitRAMControllable : IEmulatorService // maybe extend IMemoryDomains?
{
	ReadOnlySpan<byte> GetInitRAM();
	void SetInitRAM(ReadOnlySpan<byte> state);
	// could cut down movie size by storing a single repetition e.g. `[0x12, 0x34]` instead of the whole state -- but movies are already orders of magnitude larger, so this is probably unnecessary
	byte[]? GetInitRAMPattern();
	void SetInitRAMFromPattern(ReadOnlySpan<byte> unit);
}

it could be used to start a core with an older (less accurate, presumably) RAM pattern that the movie was made with, possibly allowing it to sync on subsequent releases for longer. Just call GetInitRAM() when making a new movie, saving it either in the header file or its own, and add an else if (movie.InitRAMState is not null && emulator is IInitRAMControllable initramCore) to this method:
https://github.com/TASEmulators/BizHawk/blob/fc0ebf372f57d1cfe959dd4aca63b2d4f5d31555/src/BizHawk.Client.Common/movie/interfaces/IMovie.cs#L273-L293

Start with the referenced method in src/BizHawk.Client.Common/movie/interfaces/IMovie.cs at lines 273-293 and trace how movie state is represented and loaded. Determine the needed scope for capturing and applying init RAM across emulator services; done should include a decided design and coverage for movie compatibility and synchronization.