fix(cache): Clear deps and context when get value from cache

[smalluban]

Relates to #229

Still updating properties in a chain of the observer can lead to out-of-date UI, as the render method is added to the emitter queue when the first of its dependencies has changed. Added test to this PR shows that case - render is called after the prop1 observer, so the prop1 and prop2 are updated, but before the prop3 (it is added to the queue when render is there already).

However, the PR fixes the issue where the state after that action is broken, and render has no deps anymore (before calling host.prop3 = ... cleared out deps/contexts of a whole tree, so render has no deps then, but it also will not be called, as it was called already).

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[coveralls]

coverage: 100.0%. remained the same
when pulling 333ca5a on fix-cache-clear-deps-context
into ffba323 on main.