refactor: use schema validation to validate user input

[wa0x6e]

The current user input validation is using different if/else to check for valid data

snapshot-relayer/src/api.ts

Lines 69 to 90 in 33a359c

	const msg = req.body.data?.message;
	if (!msg) {
	return res.status(400).json({
	error: 'Invalid format request'
	});
	}
	if (!req.body.data.types.Space && !msg.settings && !msg.space) {
	return res.status(400).json({
	error: 'Missing space'
	});
	}
	let address;
	try {
	address = getAddress(req.body.address);
	} catch (e: any) {
	return res.status(400).json({
	error: 'Invalid address'
	});
	}

We should move this to a cleaner implementation, using schema validation, like on sequencer (#140 (comment))