Implement `@length` on collections (#2028)

* Refactor `ConstrainedMapGenerator` slightly

* Add `@length` list operation in `constraints.smithy`

* Add more setup required for rendering constraint `list`s

* Add initial draft of `ConstrainedCollectionGenerator`

* Add license header to `LengthTraitCommon`

* Add draft of collection constraint violation generation

Copy `MapCostraintViolationGenerator` into
`CollectionConstraintViolationGenerator` for now.

* Add `Visibility.toRustQualifier`

* Implement `CollectionConstraintViolationGenerator`

* Use `TraitInfo` on `CollectionConstraintViolationGenerator`

* Update docs on `ConstrainedCollectionGenerator`

* Improve formatting on rust code

* Don't generate `ConstraintViolation` enum twice

* Make symbol provider work with constrained lists

* Fix call to `ConstraintViolation::Member`

* Render constraint validation functions for lists

* Fix call to `usize::to_string`

* Use map json customisation for collections as well

* Update to use overhauled module system

* Add constraint traits check for collection shapes

* Remove test checking that `@length` is not used in `list`s

* Refactor use of `shape.isDirectlyConstrained`

* Fix failing `UnconstrainedCollectionGeneratorTest` test

* Fix test

* Actually fix the test

* Update changelog

* Fix `constrainedCollectionCheck`

* Add tests for `ConstrainedCollectionGenerator`

* Make tests work for when sets are implemented

* Remove mention of `set` in changelog

Co-authored-by: david-perez <d@vidp.dev>

* Fix styling in `constraints.smithy`

Co-authored-by: david-perez <d@vidp.dev>

* Use `check` instead of `assert`

* Grammar fix in comment about `Option<Box<_>>`

* Rename unsupported length data class for blobs

- `UnsupportedLengthTraitOnCollectionOrOnBlobShape` -> `UnsupportedLengthTraitOnBlobShape`

* Add TODO about `uniqueItems` not being implemented yet

* Change error message: `unconstrained` -> `not constrained`

* Add imports to fix docs

* Remove unused `modelsModuleWriter` parameter

* Use `filterIsInstance` and coalesce `filter + map`

* Add `check` in json customization

* Use `Set` instead of `List` for supported contraints

* Use `toMutableList` to avoid creating an extra list

* Add `@length` list to `ConA`

* Add `@httpQuery`-bound `@length` list example

* Add `@httpHeader`-bound `@length` list

* Fix `UnconstrainedCollectionGeneratorTest` test

* Fix rendering of constrained lists as header values

* Split very long line

* Add docs for `ConstraintViolation::Member` for lists

* Pass `length` variable name to `LengthTrait.rustCondition`

* Refactor long conditional

* Homogenise conditional

Co-authored-by: david-perez <d@vidp.dev>