Examples/optimas ax generators

[shuds13]

Re: #1634

• Implement atleast single/multi fidelity and multi-task
• Test with history
• extra CI uses Optimas on multitask_uses_id branch - rem to change
• Extra tests must pass

[codecov]

Codecov Report

❌ Patch coverage is 75.86207% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.64%. Comparing base (3daf0c1) to head (cd15f07).
⚠️ Report is 8 commits behind head on experimental/jlnav_plus_shuds_asktell.

Files with missing lines	Patch %	Lines
libensemble/manager.py	70.00%	2 Missing and 1 partial ⚠️
libensemble/utils/misc.py	66.66%	1 Missing and 2 partials ⚠️
libensemble/utils/runners.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@                            Coverage Diff                            @@
##           experimental/jlnav_plus_shuds_asktell    #1635      +/-   ##
=========================================================================
+ Coverage                                  47.64%   57.64%   +9.99%     
=========================================================================
  Files                                         80       80              
  Lines                                       8125     8204      +79     
  Branches                                    1234     1258      +24     
=========================================================================
+ Hits                                        3871     4729     +858     
+ Misses                                      4033     3188     -845     
- Partials                                     221      287      +66     

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