Delete ZO Files

[MarcusHolly]

Fixes/Resolves:

Issue #1248

Changes proposed in this PR:

• Deletes ZO flowsheets, which will be archived in a separate repo
• Changes flowsheet directory from watertap/examples/flowsheets to watertap/flowsheets
• Updates various imports and hard-coded file locations

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[codecov]

Codecov Report

Attention: Patch coverage is 97.67442% with 1 line in your changes missing coverage. Please review.

Project coverage is 93.67%. Comparing base (a5103f3) to head (8fa61bd).
Report is 27 commits behind head on main.

Files with missing lines	Patch %	Lines
...wsheets/crystallization/sim_simple_crystallizer.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1438      +/-   ##
==========================================
- Coverage   93.94%   93.67%   -0.27%     
==========================================
  Files         310      285      -25     
  Lines       33206    30572    -2634     
==========================================
- Hits        31194    28638    -2556     
+ Misses       2012     1934      -78     

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[adam-a-a]

I can accept deleting the flowsheets, though I see it as unnecessary without bringing any positive outcomes.

However, I disagree with removing docs, yamls, and unit models associated with IEDO work. Why would we do this and yet keep all of the other ZO work associated with the WaterTAP3 migration?