chore!: convert library to typescript

[westeezy]

• Codebase is migrated to TypeScript by using https://github.com/Khan/flow-to-ts
• Dist folder now outputs esm folder
• Package.json update for types & modules
• Flowgen is used to generate flow types from dist/*.d.ts

[westeezy]

Published alpha @krakenjs/[email protected]

dist
├── cross-domain-utils.js
├── cross-domain-utils.js.map
├── cross-domain-utils.min.js
├── cross-domain-utils.min.js.map
├── esm
│   ├── constants.d.ts
│   ├── constants.js
│   ├── constants.js.flow
│   ├── index.d.ts
│   ├── index.js
│   ├── index.js.flow
│   ├── types.d.ts
│   ├── types.js
│   ├── types.js.flow
│   ├── util.d.ts
│   ├── util.js
│   ├── util.js.flow
│   ├── utils.d.ts
│   ├── utils.js
│   └── utils.js.flow