Add Test Suite, Achieve 80% Coverage

[ProfMoo]

Description Of Change

This PR adds a testing suite to this repository, achieving 80%+ test coverage of all relevant client files.

While working on the test suite, I ran across an old method on the client performWorkflowStep which was broken. As far as we can tell, no one uses this method and it doens't fit into the API surface of our Staking API anymore. So I've gone ahead and removed it. This makes this PR a breaking change.

I attempted to modify as little actual client code as possible while making these changes, focusing only on the testing and the appropriate coverage. Slight alterations were made, where necessary, to achieve maximal coverage (ex: exporting a method).

As you can see in the image attached in a comment, we've achieved 80%+ on statements and lines. We can still improve coverage for branches and funcs. But considering we started at 0 across the board, this is a huge improvement. The coverage image I posted can be regenerated via npm run coverage.

Testing Procedure

Added dozens of tests and achieved 80%+ test coverage :)

[cb-heimdall]

✅ Heimdall Review Status

Requirement	Status	More Info
Reviews	✅ 2/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1

[ProfMoo]

80%+ test coverage on statements and lines! You can see the summary on the top left of the image.

[ProfMoo]

Needed to bump this so that I can use the most recent versions of chai. I was running into some ESModule/Common tsconfig.json issues without it.

If this is undesired, we can try to revert and look deeper into why I was running into interop issues. Can get tricky 😬.