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 76.47%. Comparing base (873ffb1) to head (6b22c63).
⚠️ Report is 34 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 77.07% 76.47% -0.61% 
===========================================
Files 79 81 +2 Lines 8340 8679 +339 Branches 1289 1347 +58 ===========================================
+ Hits 6428 6637 +209 - Misses 1665 1751 +86 - Partials 247 291 +44 

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