Fix deadlock caused by commands invoked in string expansion during activation #1532
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Fix deadlock caused by commands invoked in string expansion during activation.
If there is an extension depending on CMakeTools, providing a command "foo.getString". When there's an entry in settings.json asking to execute this command with
{command:foo.getString}, there will be a deadlock: this extension waits for CMakeTools to activate, and CMakeTools waits for this extension to activate.So register the task provider asynchronously.