* add skeleton for global_search plugin

* base implementation of the server-side service

* add utils tests

* add server-side mocks

* move take_in_array to common folder

* implements base of client-side plugin

* add tests for server-side service

* fix server plugin tests

* implement `navigateToUrl` core API

* extract processResults for the client-side

* fetch server results from the client side

* factorize process_results

* fix plugin start params

* move things around

* move all server types to single file

* fix types imports

* add basic FTR tests

* add client-side service tests

* add tests for addNavigate

* add getDefaultPreference & tests

* use optional for RequestHandlerContext

* add registerRoutes test

* add base test for context

* resolve TODO

* common nits/doc

* common nits/doc on public

* update CODEOWNERS

* add import for declare statement

* add license check on the server-side

* add license check on the client-side

* eslint

* address some review comments

* use properly typed errors for obs

* add integration tests for the find endpoint

* fix unit tests

* use licensing start contract

* translate the error message

* fix eslint rule for test_utils

* fix test_utils imports

* remove NavigableGlobalSearchResult, use `application.navigateToUrl` instead.

* use coreProvider plugin in FTR tests

* nits

* fix service start params

* fix service start params, bis

* I really need to fix this typecheck oom error

* add README, update missing jsdoc

* nits on doc
# Conflicts:
#	.github/CODEOWNERS
#	rfcs/text/0011_global_search.md