Convert to ESM

[v1rtl]

Right now ipfs-utils is written with CommonJS, which creates issues when using with Deno. Also, ipfs-http-client and other modules are already ESM, so I think it'd be nice to have ipfs-utils as ESM as well.

I've just submitted a PR with ESM rewrite: #265

Right now node and browser works, electron doesn't work because it doesn't support es modules yet (a PR with it's support has appeared 2 weeks ago though)

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[ifgeny87]

This question worries me too. Are there any solutions to this issue?