Get rid of RxJS

[DeltaZN]

Duplicates

• [X] I have searched the proposed features

Latest version

• [X] I have tested the latest version

Suggestion ⭐

RxJS bundle is quite big, moreover, some projects might not use it, however, they'll have to include this dependency in their bundle anyway. I suggest writing a lightweight implementation which will follow this proposal. Also, we need to make sure that it's compatible with rxjs, since there are existing projects which uses our current implementaion with rxjs

Motivation 🔦

Make dxcharts-lite really lite