APOSMM accepts an initial sample, via ingest

[jlnav]

Based on concepts and keyword argument names from shuds' #1615 .

1. New do_not_produce_sample_points field, specifying to APOSMM that user will ingest first.
2. Fix various circumstances and conditions where specifying sim_id shouldn't be necessary.
3. Within gen_f: if new field is specified, keep receiving until initial_sample_size points received. Then update local_H as though "actual" evaluations were received.
4. Calling ingest first on an interfacer generator starts the background process.
5. Unit test for the above
6. [11/14] Try to account for a handful of error conditions

[codecov]

Codecov Report

❌ Patch coverage is 84.37500% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.70%. Comparing base (41a4cbc) to head (b7a79c3).

Files with missing lines	Patch %	Lines
libensemble/gen_funcs/persistent_aposmm.py	58.82%	10 Missing and 4 partials ⚠️
libensemble/generators.py	95.45%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@                            Coverage Diff                             @@
##           experimental/jlnav_plus_shuds_asktell    #1616       +/-   ##
==========================================================================
+ Coverage                                  78.73%   93.70%   +14.97%     
==========================================================================
  Files                                         79       79               
  Lines                                       7993     8051       +58     
  Branches                                    1196     1213       +17     
==========================================================================
+ Hits                                        6293     7544     +1251     
+ Misses                                      1481      324     -1157     
+ Partials                                     219      183       -36     

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