* change setClientFactory api to setClientFactoryProvider
* cleanup and add test for service
* change the signatures of SO start/setup
* fix registerCoreContext by accessing stored start contract reference
* move migration inside `start`
* adapt and add service tests
* add doc and export new types
* adapt plugins code
* update generated doc
* better core access
* address some review comments
* remove parametrized type from SavedObjectsClientFactory, use KibanaRequest instead
* add logs when starting and ending so migration
* fix KibanaRequest imports
* NITs and review comments
* fix alerting FTR test
* review comments
* crude test updates
* remove custom server typedef
* allow spaces to aquire security plugin after init
* split CoreSetup into CoreSetup and PluginsSetup
* move interfaces to new plugin
* init interceptors in legacy plugin
* fix import
* add placeholder kibana.json
* use NP Elasticsearch service instead of legacy ES Plugin
* cleanup imports
* don't destructure the es client
* introduce request facade
* document reason for getSecurity
* prefer relative imports from src/core
* fix typo in filename: inteceptors --> interceptors
* fix imports; remove stray ts-ignore
* improve typings for spaces client
* rename InterfaceExcept --> Omit
* don't use legacy config in NP
* additional comment
* shim NP config service
* fix merge from master
* revert relative imports into src/core and src/legacy
* shim capabilities modifier into new platform
* removing placeholder kibana.json
* fix prettier problem
* temporary: patch NP 'setUrl'
* migrate onRequest interceptor to NP, without tests
* fix ts error
* testing and deps cleanup for onRequestInterceptor
* replace spaces's usages of request.getBasePath with http.getBasePathFor
* add explicit timeouts for jest interceptor tests
* attempt to fix imports
* use NP logging instead of faked implementation
* revert stray yarn.lock change
* attempt to stablize and fix tests
* update jest config to include src/core/server/mocks
* fix plugin config typings
* add service tests
* fix merge
* allow spaces service to also work with legacy requests
* update interfaces to confirm to new internal/external API convention
* re-enable some post auth interceptor tests
* add explicit timeouts for tests
* prefer modifyUrl instead of manual url modification
* update logger shim to conform to PluginInitializerContext
* remove spaces ConfigClass
* don't weaken type declaration for scoped cluster client calls
* remove legacy server from SpacesCoreSetup
* remove spaces service cache
* remove legacy server as an interceptor dependency
* use modifyUrl on the raw request too
* remove unused import
* cleanup typings
* replace onRequest interceptor with new onPreAuth interceptor
* fix onPostAuth tests
* temporarily copy modifyUrl into spaces plugin
* fix mock export
* fix merge from master
* spaces scopedClient always uses updated ES client and config
* improve typings for usage collector
* rename isLegacyRequest -> isFakeRequest
* use updated NP base path API
* remove commented code
* only expose scoped spaces client
* use OptionalPlugin instead of getSecurity
* update imports of Saved Objects Service to use new src/core/server location
* update core docs
