Adding (basic) LShaped support to generic cylinders

[tvalenciaz]

Adding an option to run an --lshaped-hub and --xhatlshaped xhatter to generic cylinders.
Also adding an example to the examples based on the tutorial under development.
A test was added to the generic_tester.py on farmer and the new "relief" example.

[codecov]

Codecov Report

❌ Patch coverage is 91.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.98%. Comparing base (ca1984a) to head (e035730).

Files with missing lines	Patch %	Lines
mpisppy/utils/cfg_vanilla.py	90.90%	1 Missing ⚠️
mpisppy/utils/config.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #761      +/-   ##
==========================================
+ Coverage   73.73%   73.98%   +0.24%     
==========================================
  Files         165      165              
  Lines       21121    21144      +23     
==========================================
+ Hits        15574    15643      +69     
+ Misses       5547     5501      -46     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[DLWoodruff]

I don't understand why np 3 works here. It looks to me like there are two cylinders and you have not requested unbalanced ranks. But I guess it does work. In any event, there should be a test for this particular command, which could be in the run_all part 1 script or somewhere else.