feat(vscode-avalonia): prompt users to choose a solution file if workspace contains multiple

[BinToss]

Resolves #101

Note: commented code will not work until tc39/proposal-explicit-resource-management is formally part of ES. The commented code can be compiled with ESNext, but won't run in supported in VSCode <= v1.86.1

[prashantvc]

Can you elaborate how this feature works please? I mean as a avalonia developer how will use this feature

[BinToss]

Currently, if the workspace contains several Solution files, the extension selects the first one it finds (SolutionA) and passes it to the SolutionParser.
There's a chance SolutionA does not have any WinExe projects by design.
However, a WinExe project may exist in SolutionB, SolutionC, et cetera.

This change allows the user to choose which Solution file should be passed to SolutionParser.

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On that note, perhaps every solution file should be parsed and filtered for Solutions which include the current document. Only then should the user be prompted.

[prashantvc]

Sounds goo. Could you fix the review comments? I will merge once you do it :)

[BinToss]

I don't see any review comments to resolve.

[BinToss]

I accidentally deleted the wrong branch and I'm unable to re-open the pull request. I have to create a new one...