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_This PR is part of the multiview engine project. For a complete roadmap, see [this doc](https://docs.google.com/document/d/10APhzRDR7XqjWdbYWpFfKur7DPiz_HvSKNcLvcyA9vg/edit?resourcekey=0-DfGcg4-XWRMMZF__C1nmcA)._ ------ This PR adds view management to all engine classes that need it. View management here basically means `AddView` and `RemoveView` methods, and most importantly, how to handle the implicit view. The implicit view is a special view that's handled differently than all the other "regular views", since it keeps the behavior of the current single view of Flutter. Detailed introduction can be found in `Settings.implicit_view_enabled`. The following two graphs show the difference between initializing with/without the implicit view and creating regular views. <img width="879" alt="image" src="https://github.com/flutter/engine/assets/1596656/31244685-d9d3-4c9a-9a9e-6e8540a5711e"> <img width="864" alt="image" src="https://github.com/flutter/engine/assets/1596656/e2dd4b8c-57e3-428d-8547-834fb270052b"> <img width="860" alt="image" src="https://github.com/flutter/engine/assets/1596656/58dae687-8c17-434e-ae24-a48c2d8fa5fa"> [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style