Migrate core to TS p4 (#957)

packages/loot-core/jest.config.js

packages/loot-core/src/client/SpreadsheetProvider.tsx

packages/loot-core/src/client/actions/budgets.ts

packages/loot-core/src/client/constants.ts

packages/loot-core/src/client/platform.ts

packages/loot-core/src/client/queries.ts

packages/loot-core/src/client/query-helpers.test.ts

packages/loot-core/src/client/query-helpers.ts

packages/loot-core/src/client/query-hooks.tsx

packages/loot-core/src/client/shared-listeners.ts

packages/loot-core/src/client/tutorial.ts

packages/loot-core/src/client/update-notification.ts

packages/loot-core/src/client/upgrade-notifications.ts

packages/loot-core/src/mocks/arbitrary-schema.ts

packages/loot-core/src/mocks/budget.ts

packages/loot-core/src/mocks/index.ts

packages/loot-core/src/mocks/plaid.ts

packages/loot-core/src/mocks/redux.tsx

packages/loot-core/src/mocks/setup.ts

packages/loot-core/src/mocks/spreadsheet.ts