align vscode types implementation

[akosyakov]

What it does

• fix [plugin] align plugin types with vscode ext types #6600: rearrange types-impl file that it can be easily compared to VS Code counterpart for differences
• fix Inconsistent vscode.workspace.onDidChangeTextDocument behaviour #6895: eliminate differences for existing types

TODO:

• a CQ for copied code

How to test

• You should be able to compare https://github.com/eclipse-theia/theia/blob/akosyakov/inconsistent-vscode-workspace-6895/packages/plugin-ext/src/plugin/types-impl.ts with https://github.com/microsoft/vscode/blob/1.42.0/src/vs/workbench/api/common/extHostTypes.ts and see differences
• TBD...

Review checklist

• as an author, I have thoroughly tested my changes and carefully followed the review guidelines

Reminder for reviewers

• as a reviewer, I agree to behave in accordance with the review guidelines

[akosyakov]

For some reason typescript does not erase @theia/plugin with latest types :( We need ts 3.8 to import only types, will need to wait a bit.

[mbenz89]

I'm running into issues with the sarif viewer vscode plugin because the extension cannot find the internal vsvode types in @types/vscode (especially the Range and Position types). Essentially I got the same problem as #6895 . It seems that this PR could fix this issue by providing compatible types.

For some reason typescript does not erase @theia/plugin with latest types

I'm new to typescript. Could you clarify what that means?
Do you see any way to get this pr working with the current release or is there no other way than waiting for ts 3.8 (planned for 18.2.20)?

[tsmaeder]

Since this is still a draft PR and @akosyakov is unlikely to work on it, I'm closing this.