Experimental chunking optimisation and other performance improvements (#5871)

* Chunking optimization

* Fix comments

* Remove redundant `insertionsMinusRemovals` variable

* Fix typo

* Unblock Netlify builds

* Add placeholder

* Upgrade Playwright (fixes crash when debugging)

* Fix `autoFocus` not working

* Fix huge document test

* Fix the previous issue without changing `useSlateSelector`

* Retry `test:integration`

* Re-implement `useSlateWithV`

* Retry `test:integration`

* Update docs

* Update JS examples to match TS examples

* Upload Playwright's `test-results` directory in CI to access traces

* Change trace mode to `retain-on-first-failure`

* Fix: `Locator.fill(text)` is flaky on Editable

* Add changesets

* Increase minimum `slate-dom` version

* Update changeset

* Update 09-performance.md

* Deprecate the `useSlateWithV` hook

* Fix errors and improve clarity in 09-performance.md

* Minimum `slate-dom` version is now 0.116

* Update `yarn.lock`

.changeset/chatty-flies-pay.md

@@ -0,0 +1,5 @@
+---
+'slate-dom': minor
+---
+
+- Add `splitDecorationsByChild` to split an array of decorated ranges by child index.

.changeset/silly-crabs-sort.md

@@ -0,0 +1,5 @@
+---
+'slate': patch
+---
+
+- PERF: Use pure JS instead of Immer for applying operations and transforming points and ranges. Immer is now used only for producing fragments.

.changeset/tiny-scissors-yell.md

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+---
+'slate-react': minor
+---
+
+- Implement experimental chunking optimization (disabled by default, see https://docs.slatejs.org/walkthroughs/09-performance).
+- Add `useElement` and `useElementIf` hooks to get the current element.
+- **BREAKING CHANGE:** Decorations are no longer recomputed when a node's parent re-renders, only when the node itself re-renders or when the `decorate` function is changed.
+  - Ensure that `decorate` is a pure function of the node passed into it. Depending on the node's parent may result in decorations not being recomputed when you expect them to be.
+  - If this change impacts you, consider changing your `decorate` function to work on the node's parent instead.
+  - For example, if your `decorate` function decorates a `code-line` based on the parent `code-block`'s language, decorate the `code-block` instead.
+  - This is unlikely to result in any performance detriment, since in previous versions of `slate-react`, the decorations of all siblings were recomputed when one sibling was modified.
+- Increase minimum `slate-dom` version to `0.116.0`.
+- Deprecate the `useSlateWithV` hook
+- PERF: Use subscribable pattern for `useSlate`, `useSelected` and decorations to reduce re-renders.