Add platform/mattermost-redux package for publishing (#30020)

* Replace key-mirror with mattermost-redux/utils/key_mirror

At some point, we made our own version for mattermost-redux with proper type definitions
but we seem to have forgotten to use that everywhere in the web app.

* Remove Rudder reference from mattermost-redux

* Remove Giphy API from mattermost-redux

* Remove mattermost-webapp refernces from Client and Types packages

* Create platform/mattermost-redux without moving its source files

* Don't build mattermost-redux automatically

* Copy changes to package.json from platform/mattermost-redux to other packages

The changes to the typesVersions and exports fields are to make it
easier for tooling to know to make it so that importing a folder imports
the index file inside that folder since that's not standard to all
CommonJS packages.

The added type field is just a good pracice.

* Explicitly type re-exported selectors

For some reason, the types generated by the previous version of this didn't work
when mattermost-redux was built as a standalone package. Explicitly typing these
is a bit more verbose, but it fixes things.

* Fix import loop in selectors introduced by last commit

* Update package versions to 10.6.0

* Add explicit dependencies to mattermost-redux package

* Remove check and run scripts from mattermost-redux package

* Revert changes to NOTICE.txt

webapp/platform/client/package.json

@@ -1,12 +1,13 @@
 {
   "name": "@mattermost/client",
-  "version": "9.3.0",
+  "version": "10.6.0",
   "description": "JavaScript/TypeScript client for Mattermost",
   "keywords": [
     "mattermost"
   ],
   "homepage": "https://github.com/mattermost/mattermost/tree/master/webapp/platform/client#readme",
   "license": "MIT",
+  "type": "commonjs",
   "files": [
     "lib"
   ],