Add utility 'create' methods to OperationFolder that will create an operation...

Add utility 'create' methods to OperationFolder that will create an operation with a given OpBuilder and automatically try to fold it, similarly to OpBuilder::createOrFold. The difference here is that these methods enable folding to constants in addition to existing values. This functionality is then used to replace linalg::FunctionConstants.

PiperOrigin-RevId: 251716247