Add suite.subscribe method

[ealush]

Q	A
New feature?	✔
Documentation?	✔
Tests added?	✔
Related issues	#1073

Subscribing to Suite State Changes

You can subscribe to changes in the suite state by calling suite.subscribe(callback). The callback will be called whenever the suite state changes internally.

suite.subscribe(() => {
  const result = suite.get();
  // ... Do something with the result
});

Unsubscribing from Suite State Changes

The subscribe method returns a function that you can call to unsubscribe from the suite state changes:

const unsubscribe = suite.subscribe();

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[ealush]

@vonagam Please take a look at this, I believe this answers what we discussed

[vonagam]

Looks right.

But need a way to unsubscribe:

function subscribe(cb: CB) {
  const {off} = VestBus.on('*', () => {
    cb();
  });
  
  return off;
}

Also, interesting that every Vest.test call triggers event bus, I thought that there was some optimizations to call only once for those sync tests. Not a problem, just a note for myself to add debounce for a subscribe callback provided.

[ealush]

@vonagam added the unsubscribe function as the function's return.

And yeah. basically, internal communication in vest is done using events. This prevents different parts of the framework from knowing of one another, so they just report their current state and Vest reacts to these changes. Same with test results.