[ENH] Thread clusterers and pairwise distances

[TonyBagnall]

Describe the feature or idea you want to propose

would be nice to thread them

Describe your proposed solution

use n_jobs from base collection estimator

Describe alternatives you've considered, if relevant

No response

Additional context

No response

[aryanpola]

@TonyBagnall Add n_jobs and functionality under all the sub-modules under clustering?

[ron0studios]

Hi, I would like to have a look into this issue. I think I can get numba to use n_jobs for the pairwise distances as a start and go from there.

[MatthewMiddlehurst]

@ron0studios distances threading already has a PR currently #2545