feat: added bigint formatting

[maschad]

Related to libp2p/js-libp2p#1604

[achingbrain]

I'm surprised this doesn't work out of the box with %s - what happens when you use that formatter?

[maschad]

It works in that it prints

  libp2p:perf:trace sending 1000000000000000n bytes 

but I think it's a bit more readable to print

  libp2p:perf:trace sending 1,000,000,000,000,000 bytes

hence this PR.

[MarcoPolo]

We lose the ability to copy/paste this value. Do we want to keep that?

[maschad]

We lose the ability to copy/paste this value. Do we want to keep that?

I wouldn't say so, if that's the intention consumers could pass the %s string as @achingbrain mentioned.