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build: Introduce TypeScript into optimizely-sdk build (#504)

Summary:

Add TypeScript into the build for optimizely-sdk. The goal is to enable future development with TS and incremental conversion of modules from JS to TS.

- Uses the same TS version as subpackages (datafile-manager, event-processor, etc.)
- Uses rollup-plugin-typescript2 to add TS compilation step to rollup build
- tsconfig.json for optimizely-sdk is based on the share root tsconfig.json, with appropriate overrides
- Lint implementation is updated for TS compatibility, based on React SDK's
- Mocha test suite is updated for TS compatibility: types installed, command updated to use ts-node, based on official - Mocha TS example
- Configuration for Karma-based tests is updated to use ts-loader
- Converted string_value_validator and several other smaller modules as examples and litmus tests of the build changes

Test plan:

Manual testing using local build and linked Node app
Existing tests must pass - there are no intended functional changes
Inspected and compared build output from master branch, and this branch

Co-authored-by: Polina Nguen <43302774+yavorona@users.noreply.github.com>

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