apollo-upload-client 14.0.0 on Node.js NPM

Major

Updated Node.js support to ^10.17.0 || ^12.0.0 || >= 13.7.0.
Updated dependencies, some of which (only dev dependencies) require newer Node.js versions than previously supported.
Added a package exports field with conditional exports to support native ESM in Node.js and keep internal code private, whilst avoiding the dual package hazard. Published files have been reorganized, so previously undocumented deep imports will need to be rewritten according to the newly documented paths.
Support @apollo/client v3, fixing #174 via #175.

Added the graphql peer dependency to support a wider range of package managers, via #196.
Removed Node.js v13 and added v14 to the versions tested in GitHub Actions.
Simplified the GitHub Actions CI config with the npm install-test command.
Use Babel config overrides to ensure .js files are parsed as scripts, eliminating Babel interopRequireDefault helpers from transpilation output.
Prettier code examples in source JSDoc.
Improved the type ReactNativeFileSubstitute code example.
Updated EditorConfig.
Improved the documentation about gotchas when inspecting network requests in React Native, via #193.
Changed code examples to use import instead of require.