chore: bump version and create changelog for version 6.0.0 (angular#1…

…1140)

Correct the tag for 5.2.4

chore: bump to 6.0.0-rc.14 (angular#11081)

chore: update changelog for 6.0.0-rc.12 (angular#10902)

chore: update changelog for 5.2.5 (angular#10901)

chore: bump version to 6.0.0-rc.5 with changelog

chore: changelog for 6.0.0-rc.4 (angular#10846)

chore: bump the version to rc.3 w/ changelog (angular#10829)

cleanup: migrate migration tool to schematics (angular#10736)

* WIP: migrate migration tool to schematics

* address comments

* fix bazel

* make released version work

* Add additional rules

* wip

* wip

* yay, working

* all rules migrated

* combine packages in single `npm i` call

* update schematics version and fix TODOs

<a name="6.0.0-rc.0"></a>

* MatButtonToggleGroup causes ExpressionChangedAfterItHasBeenCheckedError ([angular#10607](angular#10607))
* focus-trap: wrong element being checked when logging deprecation warning ([angular#10578](angular#10578))

* **bottom-sheet:** handle overflowing content ([angular#10533](angular#10533)) ([cb6d469](angular@cb6d469))
* **datepicker:** add back MAT_DATE_LOCALE_PROVIDER ([angular#10602](angular#10602)) ([7fd7ad3](angular@7fd7ad3))
* **datepicker:** incorrect icon color ([angular#10458](angular#10458)) ([4e298a6](angular@4e298a6))
* **datepicker:** set canPush to false for position strategy ([angular#10609](angular#10609)) ([67c7348](angular@67c7348))
* **drawer:** better handling of high contrast mode ([angular#10418](angular#10418)) ([ff2860f](angular@ff2860f))
* **input:** inaccurate textarea check during server-side render ([angular#10467](angular#10467)) ([dda1d04](angular@dda1d04))
* **overlay:** CdkConnectedOverlay ignoring offset from position config ([angular#10451](angular#10451)) ([1659004](angular@1659004))
* **select:** MatOption state change stream not being completed ([angular#10540](angular#10540)) ([b8bb62f](angular@b8bb62f))
* **slider:** unable to slide to max value under certain conditions ([angular#10364](angular#10364)) ([d50fd3d](angular@d50fd3d)), closes [angular#10148](angular#10148)
* **sort:** add aria-sort to host when sorted ([angular#6891](angular#6891)) ([63f713f](angular@63f713f))
* **tree:** fix the MatTreeNodeOutlet not exported issue ([angular#10581](angular#10581)) ([0b8240c](angular@0b8240c))
* **tree:** improve nested tree node & fix nested tree control ([angular#10454](angular#10454)) ([2ddc257](angular@2ddc257))

* **cdk/keycodes:** add 0 and 9 numerical keypad codes ([angular#10562](angular#10562)) ([d5cd0d6](angular@d5cd0d6))
* **stepper:** allow number icon to be customized and expose template context variables ([angular#10516](angular#10516)) ([946fd84](angular@946fd84)), closes [angular#10513](angular#10513)
* **tabs:** Allow tab ink bar positioning to be determined with a provided method. ([angular#9972](angular#9972)) ([02f5256](angular@02f5256))
* **tooltip:** allow for position to be updated while open ([angular#10362](angular#10362)) ([04045d2](angular@04045d2))