* Add HTML Block rewriter
* Baseline updates
* test gaps
* Update some unit tests to represent same behavior as before
* Define Markup frame type. Tests for rendering markup frames into render tree.
* Support markup frames during diffing (retain, insert, update, delete)
* Support markup blocks on WebAssembly
* Support rendering markup frames with server-side execution too
* Support markup blocks with multiple top-level nodes. Support updating markup dynamically.
* Define MarkupString type as a way to insert dynamic markup without needing custom RenderFragment code
* Remove comment
* CR: Better null value handling
... because it's important not to disclose cross-user state, such as the number of IDs that have been assigned. Plus we don't want to run out of unique IDs, which we could if it's limited by the range of an 'int'.
- Prepare for building multiple entrypoint variants of the .js library
- Use async interop more consistently for rendering and event handling
- Add binary serializer for RenderBatch with tests