Implementing Client side Rename provider to allow variable/function rename

[Razmo99]

PR Summary

This pull request implements the VSCode RenameProvider class along with two methods within it provideRenameEdits and prepareRename the goal being to complete #261

This will allow for the client to make requests to the server side of the extension when pressing F2 to perform refactoring on variables and functions.

This client side code has been modified from the C# VSCode extension and modified to work with the Powershell extension's server side component.

There will be a sister pull request on the PowershellEditorServices repository to implement the server side.

PR Checklist

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[Razmo99]

@microsoft-github-policy-service agree

[SydneyhSmith]

Hi @Razmo99 super appreciate the detailed PR! Just want to give you a heads up that the maintainers are all pretty heads down on commitments at the moment so it may be a couple of weeks before we get a chance to review the PR