Rework pulse sequence

[NRayya]

https://terminology.nfdi4chem.de/ts/ontologies/nmrcv/terms?iri=http%3A%2F%2FnmrML.org%2FnmrCV%23NMR%3A1400037&obsoletes=false

• Assert all the pulse sequences directly under NMR pulse sequence
• Add further grouping classes for convenience:
  • NMR pulse sequence by dimension (we will have to add an object property called “has dimension”)
  • NMR pulse sequence by modularity (we will have to add an object property called “has modularity”)
  • NMR pulse sequence by Continuation (Active vs Legacy) - We can skip it for now and add it to later issue.
• NMR Method - def and hierarchy #24
  • (we will have to add an object property called “has technique” )