Add property assignment completion for enums

[MartinGC94]

PR Summary

Adds completion for properties that are enums, like: $PSStyle.Progress.View=<Tab>

PR Context

Fixes #18885

PR Checklist

• PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• Summarized changes
• Make sure all .h, .cpp, .cs, .ps1 and .psm1 files have the correct copyright header
• This PR is ready to merge and is not Work in Progress.
  • If the PR is work in progress, please add the prefix WIP: or [ WIP ] to the beginning of the title (the WIP bot will keep its status check at Pending while the prefix is present) and remove the prefix when the PR is ready.
• Breaking changes
  • None
  • OR
  • Experimental feature(s) needed
    • Experimental feature name(s):
• User-facing changes
  • Not Applicable
  • OR
  • Documentation needed
    • Issue filed:
• Testing - New and feature
  • N/A or can only be tested interactively
  • OR
  • Make sure you've added a new test if existing tests do not effectively test the code changed
• Tooling
  • I have considered the user experience from a tooling perspective and don't believe tooling will be impacted.
  • OR
  • I have considered the user experience from a tooling perspective and opened an issue in the relevant tool repository. This may include:
    • Impact on PowerShell Editor Services which is used in the PowerShell extension for VSCode
      (which runs in a different PS Host).
      • Issue filed:
    • Impact on Completions (both in the console and in editors) - one of PowerShell's most powerful features.
      • Issue filed:
    • Impact on PSScriptAnalyzer (which provides linting & formatting in the editor extensions).
      • Issue filed:
    • Impact on EditorSyntax (which provides syntax highlighting with in VSCode, GitHub, and many other editors).
      • Issue filed:

[PaulHigin]

@daxian-dbw Can you take a look?

[pull-request-quantifier-deprecated]

This PR has 14 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!

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Quantification details

Label      : Extra Small
Size       : +14 -0
Percentile : 5.6%

Total files changed: 2

Change summary by file extension:
.cs : +11 -0
.ps1 : +3 -0

Change counts above are quantified counts, based on the PullRequestQuantifier customizations.

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[daxian-dbw]

LGTM

[PaulHigin]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 8 pipeline(s).

[PaulHigin]

Thanks for your contribution!

[ghost]

🎉v7.4.0-preview.2 has been released which incorporates this pull request.:tada:

Handy links:

• Release Notes