Add multiple phase realizations to waves

[jtgrasb]

Description

This PR adds a realization dimension to the waves DataArray (Issue #262). The number of realizations is set equal to 1 by default, but is set to 5 for tutorial 3 and 4 which have irregular waves. The solve() function now loops over multiple phase realizations and returns a list of the results from all optimizations.

Type of PR

• Bug fix
• New feature
• Documentation
• Other: (specify)

Checklist for PR

• Authors read the contribution guidelines
• The pull request is from an issue branch (not main) on your fork, to the main branch in WecOptTool.
• The authors have given the admins edit access
• All changes adhere to the style guide including PEP8, Docstrings, and Type Hints.
• Modified the documentation if applicable
• Modified or added a new test
• All tests pass
• Reference or close any relevant issues

Additional details

I am still working on adding a section to one of the tutorials to demonstrate multiple phase realizations vs. a longer time window.

[coveralls]

Pull Request Test Coverage Report for Build 7134822091

• 115 of 116 (99.14%) changed or added relevant lines in 5 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.05%) to 93.983%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
wecopttool/core.py	50	51	98.04%

Totals
Change from base Build 6910014540:	0.05%
Covered Lines:	2499
Relevant Lines:	2659

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💛 - Coveralls

[jtgrasb]

I have updated this PR and it is ready for review. The waves.py script has been updated such that when creating an irregular wave, there is now an option to input the number of wave phase realizations and the output is a waves variable with an extra dimension/coordinate called realization. The solve() function of the core.py script takes in the waves Dataset and iterates over the realizations, outputting a list of optimized results. Even when 1 realization is used, I've left the output as a list of length 1 for consistency. I've also updated the tutorials accordingly, with LUPA and Pioneer now using multiple realizations. The tests have also been updated.

I am still working on a demonstration of how to determine the number of phase realizations needed. I think it is best to merge this PR to include the functionality in WecOptTool, and I will work on another PR which updates one of the tutorials to demonstrate the multiple phase realizations and a reliable method for determining the number to use.

[cmichelenstrofer]

Looks really good! just some minor changes. I reviewed the source and tests but not the tutorials.