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   +/-   ##
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  Files                                            ?       93           
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  Hits                                             ?     6282           
  Misses                                           ?     1984           
  Partials                                         ?      224           

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