This patch adds support for `PredTypeTrait` and `PredAttrTrait` in type
and attribute definitions, enabling declarative predicate-based
verification similar to how `PredOpTrait` works for operations.
## Motivation
In 802bf02 (from 2021), `PredTypeTrait`/`PredAttrTrait` were defined in
TableGen but not implemented in the code generator. Using them causes
mlir-tblgen to crash with an assertion failure when trying to cast
`PredTrait` to `InterfaceTrait`. This patch fixes the crash and
implements the actual verification code generation.
## Usage
Use `$paramName` syntax in predicates to reference type/attribute
parameters:
```tablegen
def MyType : MyDialect_Type<"MyType",
[PredTypeTrait<"value must be positive", CPred<"$value > 0">>]> {
let parameters = (ins "unsigned":$value);
let mnemonic = "my_type";
let assemblyFormat = "`<` $value `>`";
}
```
This generates verification code in `verifyInvariantsImpl()`:
```cpp
if (!(value > 0)) {
emitError() << "failed to verify that value must be positive";
return ::mlir::failure();
}
```
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