(maint) Implementing unit tests for language server

[AdmiringWorm]

Description

This PR adds unit tests for the language server

Related Issue

No related issue (yet)

Motivation and Context

To validate that the rules work as expected (mainly)

How Has This Been Tested?

Locally

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Unit Tests

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes. (this is the purpose of this PR)
• All new and existing tests passed.

[AdmiringWorm]

Odd, I ran this locally and it succeeded. Will try changing the language version to see if it helps.

[AdmiringWorm]

@gep13 @mkevenaar I have gotten started on implementing unit tests for the language server.
I have created the 'unit-tests' branch for this purpose, so we all are able to add new unit tests more easily.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (develop@f25f175). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff             @@
##             develop       #6   +/-   ##
==========================================
  Coverage           ?   41.92%           
==========================================
  Files              ?       37           
  Lines              ?      675           
  Branches           ?      155           
==========================================
  Hits               ?      283           
  Misses             ?      370           
  Partials           ?       22

Impacted Files	Coverage Δ
...rce/chocolatey-language-server/Models/MetaValue.cs	75% <100%> (ø)

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