[Feature Request] Cluster radii code duplication

[bfonta]

A new PR is needed for the following, discussed in the last resolved comment of #47.

(...) involve merging my [@mchiusi] run_radii_chain and @isehle run_cluster_size scripts to use the run_default_chain and run_new_chain. It's not a trivial task because the current code in these latter scripts doesn't allow running the clustering step multiple times. While I don't think it's difficult, I would prefer to open a new PR and address these code repetitions. After making these modifications, we should also test all the chains independently from the webApp. What do you think? (...)

Is your feature request related to a problem? Please describe.
Merging duplicate code.

Describe the solution you'd like and (optionally) propose some code to make it happen
@mchiusi @isehle

Describe alternatives you've considered
@mchiusi @isehle

[bfonta]

Issue duplicated in #50.