graph regex improvement

Add the quantification to the graph regex

• {n}
• {n-m}

Add to the parallel matching the groupe ex : (A->(A->B))

added 1 deleted label

changed the description

mentioned in merge request !138 (merged)

added Feature 🚀 label

This is implemented in SimplePassGraphMatching:

• {n} is supported;
• {n-m} is not supported but currently lacks a clear use case (it could be supported in the future);
• Parallel matching is supported with the "&" operator.

closed