Initial Eik adaptations

[stipsan]

EDIT: I didn't mean to open the PR here, hahah we're working on a custom fork and we're not sure our usecase makes sense for general microbundle users 😅

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[developit]

@stipsan FWIW I'd be open to supporting Import Maps in Microbundle. We intend to support Export Maps as well.

[stipsan]

@developit that's awesome! We're starting to test import maps and esm with shared libraries on the cdn in production. We're expecting to do some iterations on this before we land on a setup that works well.
The intentions of our fork is to be able to try out different approaches quickly, but the endgame is we'd like to collab on landing changes upstream so that the fork is no longer necessary 🙂
/cc @trygve-lie @digitalsadhu