[Enhancement] Add script for analyzing lit components and generating Angular proxies

[RasmusKjeldgaard]

Lit has support for creating react-compatible wrappers for lit components, but never got around to officially supporting an angular generator - see https://github.com/lit/lit/discussions/4525#discussioncomment-8288794.

They do however mention rolling your own for better framework integration, and have done some initial work here: https://github.com/lit/lit/tree/main/packages/labs/gen-wrapper-angular

Consider creating a hand-coded wrapper to begin with to know what the generator should do - some inspiration can be found here: https://github.com/lit/lit/pull/2817

Further reading/inspiration:

• https://github.com/ionic-team/stencil-ds-plugins-demo/blob/master/packages/component-library-angular/src/directives/proxies.ts
• https://github.com/lit/lit/tree/main/packages/labs/gen-wrapper-angular

High level tasks

• Traverse custom element folders
• Write angular component with same selector to disk
• Extract props, dispatchEvent and public methods from lit element
• Declare props as inputs on angular proxy
• Create getters/setters for inputs
• Create EventEmitters from dispatchEvent
• Create proxy methods
• Run script during development flow

Considerations

• PoC custom-elements-manifest vs. lit labs analyzer