fix: update tasks sidebar on config change notification

[nayeemrmn]

Fixes #963. Coupled with denoland/deno#20827. The tasks sidebar will now only work with Deno 1.37.2 or whichever version that PR lands for, since it depends on the sourceUri being included in task definitions.

[bartlomieju]

LGTM. Curious; does this panel list both "tasks" from "deno.json" file as well as "scripts" from "package.json"? (That's what deno task does internally, adding a comment that certain script is from package.json).

[nayeemrmn]

does this panel list both "tasks" from "deno.json" file as well as "scripts" from "package.json"?

It doesn't apparently, we would patch that in main repo by including it in the deno/task response