Vote on the second draft of ICRC-3

[MarioDfinity]

This issue is an official vote of the Ledger & Tokenization Working Group on ICRC-3 as specified https://github.com/dfinity/ICRC-1/pull/128. How to vote:

React to this issue with 👍 if you agree with the ICRC-3 proposal and to bring it to an NNS vote. React with 👎 and leave a comment with your objection if you oppose. The Working Group will accept only the votes of the core members, i.e., the members regularly contributing to the WG. However, if you aren't a core working group member but have technical objections or comments to this proposal, please leave a comment. We'll try to address it according to the rough consensus model.

[roman-kashitsyn]

I've just voted for the NNS proposal. I like what you did with btype and the list of supported blocks. Great work, folks!