[mlir][LLVM] Add the `ConvertToLLVMAttrInterface` and `ConvertToLLVMOpInterface` interfaces (#99566) This patch adds the `ConvertToLLVMAttrInterface` and `ConvertToLLVMOpInterface` interfaces. It also modifies the `convert-to-llvm` pass to use these interfaces when available. The `ConvertToLLVMAttrInterface` interfaces allows attributes to configure conversion to LLVM, including the conversion target, LLVM type converter, and populating conversion patterns. See the `NVVMTargetAttr` implementation of this interface for an example of how this interface can be used to configure conversion to LLVM. The `ConvertToLLVMOpInterface` interface collects all convert to LLVM attributes stored in an operation. Finally, the `convert-to-llvm` pass was modified to use these interfaces when available. This allows applying `convert-to-llvm` to GPU modules and letting the `NVVMTargetAttr` decide which patterns to populate.
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