Add support for TypeScript usage with typescript-eslint-parser

Using [typescript-eslint-parser](https://github.com/eslint/typescript-eslint-parser), ESLint configurations can be enforced on TypeScript files.

Modifying `.js,.jsx` to `.js,.jsx,.ts,.tsx` in the following files would fix most of the issues with TypeScript integration:

- https://github.com/airbnb/javascript/blob/master/packages/eslint-config-airbnb/rules/react.js
- https://github.com/airbnb/javascript/blob/master/packages/eslint-config-airbnb-base/rules/imports.js

Start with packages/eslint-config-airbnb/rules/react.js and packages/eslint-config-airbnb-base/rules/imports.js, inspecting how their .js and .jsx file extensions are configured. Update the relevant extension lists to include .ts and .tsx, and consider the work complete when ESLint configurations apply to TypeScript files through typescript-eslint-parser.

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