Blogpost: what are our current plans for juggler modernization

[bajtos]

As discussed in July Maintainers Call, we should write a blog post to capture our current thinking about juggler modernization.

• Allow connectors to by written as ES6 classes, in async/await style, using TypeScript.
• Decouple modelling (model definition) from data-access methods.
• Provide a well-specified interface between juggler/repository and connectors.
• Explore integration with other ORM/ODM frameworks (TypeORM, Mongoose). If we can get first-class experience with 3rd party frameworks, then we can eventually move away from juggler.

/cc @achrinza