Make SCI dependency optional for smaller JS builds

[Naomarik]

Currently in the context of my application I will never have a need for it and it adds 93kb gzipped at compression level 6.

[ikitommi]

Did a quick test using shadow-cljs:

metosin/malli 43.1 KB
borkdude/sci  63.6 KB

The malli is currently not optimized either for bundle size. Will make sci optional and try to make malli smaller too.

[ikitommi]

Added shadow-cljs as dev-dependency and guide how to measure the bundle sizes. With the latest versions (sci got docstrings, making it a lot bigger):

metosin/malli 50KB -> 11.8KB GZIP
borkdude/sci  564KB - > 120KB GZIP

[ikitommi]

Not sure how correctly the bundle size is calculated, but here goes the report:

[borkdude]

Work in progress at #210. It works, but the tests need to be refactored to account for the optionality of sci.

[borkdude]

I have closed the PR. Instead, I'm offering you this library https://github.com/borkdude/dynaload. If you need any help, let me know. :)

[ikitommi]

thanks, will try that :)

[ikitommi]

Will be fixed in #227 .

[ikitommi]

sci is now disabled by default. README has guide how to enable it for cljs. With the minimal dummy sample app:

• js: 757,8kb -> 136kb
• gzipped: 161kb -> 31,5kb

with sci:

without (default):