monorepo: esm support

[ryanio]

This PR adds ./dist.esm builds for each package and fixes errors encountered.

WIP, some last few issues to fix, but this should be the majority of it.

[holgerd77]

That's really great! 👍

Some note: if we want to integrate in the current minor releases, we should give this some really extensive testing - eventually even consider doing a round of rc releases (though I am not to keen on that one) - otherwise this is likely too risky.

So really do some test installations in various environments and see how things go.

[ryanio]

going to pick this back up and get it updated to the latest master, so we can ship esm support

[holgerd77]

going to pick this back up and get it updated to the latest master, so we can ship esm support

Ok, great, I guess it makes sense to then include this in the coming - originally - EIP-1153 focused release round mid next week or so?

Or can't you completely foresee how long this will take (or does this no make sense for other reasons?)?

[paulmillr]

It would be great to understand if that's needed. If yes, we could make a round of js-eth-crypto releases as well

[ryanio]

continued in #1936