#91969

fixes #91416

fixes #34981

A RunOnceScheduler (this.fetchThreadsScheduler) is used to throttle
fetching threads from debug adapters. this.fetchThreadsScheduler is
disposed when a debug adapter is restarted because of:

    this.rawListeners.push(this.fetchThreadsScheduler);

This causes threads to never be fetched after restarting the debug
adapter.

This is fixed by setting this.fetchThreadsScheduler to undefined after
it is disposed. This way, a new RunOnceScheduler is created after
restarting the debug adapter.

Fixes #88784

fixes #87129

fixes #82354

fixes #82354

#81574

This way debug sessions sharing a single repl will all be notified about new
repl elements and UI will be updated.

- recognizes web urls;
- checks that file path exists;
- supports relative to workspace root paths (./foo);
- supports relative to home dir paths (~/foo);
- optional line/column;
- smoke test.

fixes #81303

fixes #55106

Introduced DebugSessionOptions passed to debug.startDebugging which
encapsulated DebugConsoleMode to control this behavior.

fixes #80374

When source with passed uri has not been seen before, and didn't end up DebugSession.sources map,
existing code throws an exception by constructing an invalid uri. Using Source.getEncodedDebugData helps.

REPL now has two elements: one for the evaluation text added immediately (ReplEvaluationInput),
and another for the evaluation result once available (ReplEvaluationResult).