Function load_escrow 

pub fn load_escrow<'a, 'info>(
    info: &'a AccountInfo<'info>,
    authority: &Pubkey,
    is_writable: bool,
) -> Result<(), ProgramError>

Errors if:

• Owner is not relay program.
• Data is empty.
• Account cannot be parsed to a escrow account.
• Escrow authority is not expected value.
• Expected to be writable, but is not.