🧪 MLIR - Explicitly add Tests for MQTDyn Dialect Language Features

[DRovara]

Problem Statement

Since #948, MQT Core now explicitly tests all main features of the MQTOpt dialect.
For MQTDyn, on the other hand, we only have a single big test file at the moment.

To better test MQTDyn, we should improve its test suite in a similar fashion.

Proposed Solution

A single test file dialect_features.mlir for the MQTDyn dialect. It should contain (more or less) the same test cases as the MQTOpt dialect_features.mlir introduced in #948, just reformulated for MQTDyn.