Extendability of the compiler

[plusgut]

Is your feature request related to a problem? Please describe.
As a library-developer i would like to have the possibility to interop with javascript, to enable all kinds of features for application-developers

Describe the solution you'd like
Giving the compiler cli-flags with paths to lua scripts

Describe alternatives you've considered
Another option would have been to do extendability through haskell, but that would have meant that the application-developer needs to compile the compiler themselfes

Additional context
Interop to browser functionality is needed for giving application developers the option to have routers, localization, intersection-observer, ...
All of the mentioned usecases(and many more) shouldn't be covered by the compiler itself but through plugins.

[plusgut]

To enable extend ability, streaming api needs to be implemented #91