Virtual-folder

[connectdotz]

We have come a full circle on this issue - supporting multiple jest configs for a given workspace. This is common for monorepo projects and projects with multiple test environments, such as unit and integration tests. We implemented monorepo support with vscode multi-root workspaces a few years ago. However, this fell short of addressing multi-test-environment that share the same code base (folder).

This PR addresses this gap by introducing the concept of virtual folders. A virtual folder defines a jest runtime environment, customizable with all resource level settings, such as jestCommanLine, rootPath. Multiple virtual folders can reside in any given vscode workspace folder via jest.virtualFolders. See details documented in the README.md file.

The code change outline:

• expand the JestExt to be workspace "agnostic", i.e. it can work with either the actual vscode.WorkspaceFolder or virtualFolder.
• update workspace-manager, extension-manager, StatusBar, CoverageCodeLensProvider etc to work with virtual folders.
• update DebugConfigurationProvider to append the folder name to the generated configuration names.
• adjust the setup wizard to work with virtual folders. (except the monorepo setup, which will ignore virtual folders)
• a few refactoring and code organization change.
• tests adjustment accordingly.

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resolve #870
resolve #428

[coveralls]

Pull Request Test Coverage Report for Build 5307024458

• 392 of 392 (100.0%) changed or added relevant lines in 19 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.04%) to 97.771%

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Totals
Change from base Build 5262287914:	0.04%
Covered Lines:	3543
Relevant Lines:	3563

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💛 - Coveralls