Final Semantic Tokens API check

[alexdima]

Testing - #86415 #585 #92273

• anyOS @jrieken
• anyOS @Tyriar

Complexity: 4

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Use the sample at https://github.com/microsoft/vscode-extension-samples/tree/master/semantic-tokens-sample

The sample implements a full document semantic tokens provider. Please implement a document range semantic tokens provider by doing small edits to the existing sample. Please check that:

• when opening a file, first a request to the document range provider is made
• once the request to the document provider is complete, no further requests are made to the document range provider

While doing this, please check that the API is available without any proposed API flags and that the JSDoc comments make sense.