Indicate lack of test coverage in the editor

[jcayzac]

I wish the Deno extension could give me some visual feedback about the lines/branches that are not covered by my tests.

I can somehow approximate what I would like if I use deno coverage to generate an .lcov report, then use markis.code-coverage extension, but this isn't optimal.

My current workaround also doesn't work with the testing code lens (see #1017 for a somewhat related issue).

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