* [data.search] Add search session methods to search service contract
* Fix types
* Fix tests and switch to cancel
* Update docs
* Fix types/tests
* Fix tests
* Update status of SO before cancelling search requests
* Add API integration test
* Fix types
* Update expiration route to use config defaultExpiration
* Fix test
* Update docs
* New logic for extend
* Remove declare module
* Review feedback
* fix ts
* Remove test that is no longer valid
* Fix undefined bug
* Use DataRequestHandlerContext in maps
* ts
Co-authored-by: Liza K <liza.katz@elastic.co>