Unify Custom transaction error codes

[teor2345]

Currently, subspace has Custom error codes in 3 different locations, which has led to clashes multiple times: (including 200 here)

subspace/domains/primitives/runtime/src/lib.rs

Lines 85 to 88 in bf75508

	/// Custom error when nonce overflow occurs.
	pub const ERR_NONCE_OVERFLOW: u8 = 100;
	/// Custom error when balance overflow occurs.
	pub const ERR_BALANCE_OVERFLOW: u8 = 200;

subspace/crates/sp-domains-fraud-proof/src/lib.rs

Lines 49 to 64 in bf75508

	/// Custom invalid validity code for the extrinsics in pallet-domains.
	#[repr(u8)]
	pub enum InvalidTransactionCode {
	TransactionProof = 101,
	ExecutionReceipt = 102,
	Bundle = 103,
	FraudProof = 104,
	BundleStorageFeePayment = 105,
	}
	impl From<InvalidTransactionCode> for InvalidTransaction {
	#[inline]
	fn from(invalid_code: InvalidTransactionCode) -> Self {
	InvalidTransaction::Custom(invalid_code as u8)
	}
	}

subspace/domains/pallets/messenger/src/lib.rs

Lines 49 to 53 in bf75508

	pub(crate) mod verification_errors {
	pub(crate) const INVALID_CHANNEL: u8 = 200;
	pub(crate) const INVALID_NONCE: u8 = 201;
	pub(crate) const NONCE_OVERFLOW: u8 = 202;
	}

This potentially causes bugs if we match on the error code in production or test code. It also makes logs harder to read.

We should move all these codes next to each other, in the same file.