Making new gpCAM gen class

[shuds13]

Make ask/tell classes for gpCAM and RandSample, separate from existing user functions

• Make gpCAM and Randsample classes
• Revert gen functions to original

Note for review:

• New gen_classes directory alongside gen_funcs

Parameters to ask/tell constructor:
H, gen_specs, persis_info, libE_info | original
gen_specs H, persis_info, libE_info | Required parameter first, followed by optional.
gen_specs, persis_info, H, libE_info |

Change H to H0?
Should we have libE_info?

Alt. we could pull this in to parent branch and decide there - going with this.

[codecov]

Codecov Report

Attention: Patch coverage is 36.92308% with 41 lines in your changes missing coverage. Please review.

Please upload report for BASE (experimental/jlnav_plus_shuds_asktell@fa87f59). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
libensemble/gen_funcs/persistent_gpCAM.py	0.00%	39 Missing ⚠️
libensemble/gen_classes/sampling.py	91.66%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@ Coverage Diff @@## experimental/jlnav_plus_shuds_asktell #1316 +/- ##
========================================================================
Coverage ? 73.99% ========================================================================
Files ? 93 Lines ? 8490 Branches ? 1500 ========================================================================
Hits ? 6282 Misses ? 1984 Partials ? 224 

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.