Typescript: GraphQL queries

[joonaojapalo]

Note, this depends on PR #4619.

Proposed Changes

• relay-compiler, react-relay and their essential dependencies updated to version 14 (including package @digitransit-search-util/digitransit-search-util-query-utils)
• Relay 14 operates directly on GraphQL Schema file (schema.graphql). A script to fetch this from OpenTripPlanner GH repo is added.
• New package.json script graphql:schema:update updates GraphQL schema files for both app and @digitransit-search-util/digitransit-search-util-query-utils.
• New API for relay-runtime/fetchQuery() returns Observable instead of Promise. Fixed by conversion via Observable.toPromise() method.

Pull Request Check List

• A reasonable set of unit tests is included
• Console does not show new warnings/errors
• Changes are documented or they are self explanatory
• This pull request does not have any merge conflicts
• All existing tests pass in CI build
• Code coverage does not decrease (unless measured incorrectly)

Review

• Read and verify the code changes
• Test the functionality by running the UI locally with all popular browsers available in your platform
• Check that the implementation matches the design, when such one is defined in a Jira issue
• Merge the pull request