[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

Describe your proposed solution

• [ ] Combine two multirocket variants into one #1711
• [ ] Combine minirocket and minirocket variable length
• [x] Benchmark variants against alternative implementations #214
• [ ] GPU implementations, benchmark vs CPU #313 #1248
• [ ] Profile memory usage #1126
• [ ] Tidy up multirocket implementation
• [x] Minirocket has hard coded arrays that reduce readability. Replace with a numba function Done: #1698
• [x] Combine minirocket and minirocket multivariate #1708

[TonyBagnall]

Time wise results as expected, also comparable to other implementations. This to transform different length series in a univariate collection size of 100, length on x axis, y axis is seconds