Add utilities function for creating impedance dataarrays

[jtgrasb]

Description

This PR resolves #300 by adding a function in the utilities module to create dataarrays for the excitation and impedance. The function is also demonstrated in the pioneer tutorial.

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 dev 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

N/A

[coveralls]

Pull Request Test Coverage Report for Build 12998828717

Details

• 4 of 18 (22.22%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.4%) to 94.068%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
wecopttool/utilities.py	4	18	22.22%

Totals
Change from base Build 12996485111:	-0.4%
Covered Lines:	2775
Relevant Lines:	2950

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💛 - Coveralls