Make use of SPELs new `#[account_type]` directive

[0x-r4bbit]

This has been introduced in logos-co/spel@62f91e2

We can apply these to our programs and update the IDL

[0x-r4bbit]

There's a bug in SPEL that it doesn't properly searches all mods of the code, resulting in account directives not being found everywhere.