jest-diff: Add firstOrLastEmptyLineReplacement option and export 3 diffLines functions (#8955)

* jest-diff: Add trimmableLineReplacement option and export 3 diffLines functions

* Fix prettier lint error in README.md

* Update CHANGELOG.md

* Rename function and remove unneeded export

* Add splitLines0 as a named export

* Fix prettier error in README.md

* Move edge cases and splitLines0 after diffLinesUnified

* Rename trimmableLineReplacement as firstOrLastEmptyLineReplacement

* Fix prettier error in diff.test.ts file

* Rename option in CHANGELOG.md

Author: pedrottimark

CHANGELOG.md

@@ -13,6 +13,7 @@
 - `[jest-diff]` Add `includeChangeCounts` and rename `Indicator` options ([#8881](https://github.com/facebook/jest/pull/8881))
 - `[jest-diff]` Add `changeColor` and `patchColor` options ([#8911](https://github.com/facebook/jest/pull/8911))
 - `[jest-diff]` Add `trailingSpaceFormatter` option and replace cyan with `commonColor` ([#8927](https://github.com/facebook/jest/pull/8927))
+- `[jest-diff]` Add `firstOrLastEmptyLineReplacement` option and export 3 `diffLines` functions ([#8955](https://github.com/facebook/jest/pull/8955))
 - `[jest-environment-jsdom]` Add `fakeTimersLolex` ([#8925](https://github.com/facebook/jest/pull/8925))
 - `[jest-environment-node]` Add `fakeTimersLolex` ([#8925](https://github.com/facebook/jest/pull/8925))
 - `[@jest/fake-timers]` Add Lolex as implementation of fake timers ([#8897](https://github.com/facebook/jest/pull/8897))