Allow pallet error enum variants to contain fields (#10242)

* Allow pallet errors to contain at most one field

* Update docs on pallet::error

* Reword documentation

* cargo fmt

* Introduce CompactPalletError trait and require #[pallet::error] fields to implement them

* cargo fmt

* Do not assume tuple variants

* Add CompactPalletError derive macro

* Check for error type compactness in construct_runtime

* cargo fmt

* Derive CompactPalletError instead of implementing it directly during macro expansion

* Implement CompactPalletError on OptionBool instead of Option<bool>

* Check for type idents instead of variant ident

* Add doc comments for ErrorCompactnessTest

* Add an trait implementation of ErrorCompactnessTest for ()

* Convert the error field of DispatchError to a 4-element byte array

* Add static check for pallet error size

* Rename to MAX_PALLET_ERROR_ENCODED_SIZE

* Remove ErrorCompactnessTest trait

* Remove check_compactness

* Return only the most significant byte when constructing a custom InvalidTransaction

* Rename CompactPalletError to PalletError

* Use counter to generate unique idents for assert macros

* Make declarative pallet macros compile with pallet error size checks

* Remove unused doc comment

* Try and fix build errors

* Fix build errors

* Add macro_use for some test modules

* Test fix

* Fix compilation errors

* Remove unneeded #[macro_use]

* Resolve import ambiguity

* Make path to pallet Error enum more specific

* Fix test expectation

* Disambiguate imports

* Fix test expectations

* Revert appending pallet module name to path

* Rename bags_list::list::Error to BagError

* Fixes

* Fixes

* Fixes

* Fix test expectations

* Fix test expectation

* Add more implementations for PalletError

* Lift the 1-field requirement for nested pallet errors

* Fix UI test expectation

* Remove PalletError impl for OptionBool

* Use saturating operations

* cargo fmt

* Delete obsolete test

* Fix test expectation

* Try and use assert macro in const context

* Pull out the pallet error size check macro

* Fix UI test for const assertion

* cargo fmt

* Apply clippy suggestion

* Fix doc comment

* Docs for create_tt_return_macro

* Ensure TryInto is imported in earlier Rust editions

* Apply suggestions from code review

Co-authored-by: Bastian Köcher <[email protected]>

* Fix up comments and names

* Implement PalletError for Never

* cargo fmt

* Don't compile example code

* Bump API version for block builder

* Factor in codec attributes while derving PalletError

* Rename module and fix unit test

* Add missing attribute

* Check API version and convert ApplyExtrinsicResult accordingly

* Rename BagError to ListError

Co-authored-by: Kian Paimani <[email protected]>

* Use codec crate re-exported from frame support

* Add links to types mentioned in doc comments

Co-authored-by: Bastian Köcher <[email protected]>

* cargo fmt

* cargo fmt

* Re-add attribute for hidden docs

Co-authored-by: Bastian Köcher <[email protected]>
Co-authored-by: Kian Paimani <[email protected]>