feat: use JSON5 for INPUT.json

[szmarczak]

Fixes #905

[vladfrangu]

Could add a test in packages/core/test/user-input.test.ts for inputs with comments 👀

[B4nan]

We should probably move this to some other place. Right now you adjusted this only for crawlee (Actor.getInput() does not go thru this path) and only for the root ./INPUT.json file.

I would be in favour of doing this in the memory storage too, thoughts @vladfrangu?

edit: for input only I guess, or maybe for KVS, definitely not for dataset and RQ

[vladfrangu]

If we want to add full JSON5 support, we should probably use https://github.com/json5/json5 or similar then. Could see it being useful for others dealing with JSON files, and I'd be fine with adding support for it in memory-storage

[B4nan]

Can you please verify how does it stand performance wise?

I guess I would be up for it, just checked the size of crawlee package, and I guess there is no sense is trying to spare 200 kilobytes when its so huge :D

[pocesar]

I'd vote for using the json5 battled-tested lib. it's still a pain to have multiple JSON files under default KV when testing locally.

[szmarczak]

Added an E2E test for INPUT file loading. It also tests Actor.getInput().