Globus compute - "mode" features and tests

[jlnav]

When the simulator function is configured to be sent to a globus compute endpoint, the Manager becomes the only necessary process, since it also runs the gen.

classic and "new" style sims are both supported. sim output/input are both handled/encapsulated as though they came from "virtual" workers.

[codecov]

Codecov Report

❌ Patch coverage is 67.75956% with 118 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.95%. Comparing base (ebcff5a) to head (a4d74df).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
libensemble/manager.py	59.86%	44 Missing and 15 partials ⚠️
libensemble/executors/globus_compute_executor.py	72.43%	32 Missing and 11 partials ⚠️
libensemble/utils/globus_compute.py	82.69%	8 Missing and 1 partial ⚠️
libensemble/libE.py	36.36%	4 Missing and 3 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1753      +/-   ##
===========================================
- Coverage    89.82%   88.95%   -0.88%     
===========================================
  Files           80       82       +2     
  Lines         8643     8982     +339     
  Branches      1335     1393      +58     
===========================================
+ Hits          7764     7990     +226     
- Misses         667      750      +83     
- Partials       212      242      +30     

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