[ENH] Tidy up the rocket transformers

[TonyBagnall]

Describe the feature or idea you want to propose

Its time to tidy up the convolutional transformers, will collate all issues here and make tasks for smaller PRs. Replaces #208

To Do

• [ ] Combine minirocket and minirocket variable length
• [ ] GPU implementations, benchmark vs CPU #313 #1248
• [ ] Profile memory usage #1126
• [ ] Tidy up multirocket implementation, remove duplicate methods and repeated code from minirocket
• [ ] Decorate numba functions in rocket, test if any speed up
• [ ] Test for numpy 2 compatibility, and optimise (e.g. G = _X + _X + _X)

Done

• [x] Minirocket has hard coded arrays that reduce readability. Replace with a numba function Done: #1698
• [x] Combine minirocket and minirocket multivariate #1708
• [x] Benchmark variants against alternative implementations #214
• [x] Combine two multirocket variants into one #1711