ICRC-122: ledger blocks recording management actions -- authorised mint, authorised burn blocks

[bogwar]

Real World Asset ledgers require several management APIs that would allow authorised entities to carry out ledger changes. This standard introduces two new blocktypes:

• block type 122burn that records tokens from an account were burned by an authorised party
• blocktype 122mint that records that tokens were minted to an account by an authorised party

[Copilot]

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ICRCs/ICRC-122/ICRC-122.md:7

• There is a documentation inconsistency regarding account representation: line 7 specifies an array of two Value variants (using an empty Blob for no subaccount) while line 48 describes an array of one or two blobs. Please clarify and standardize the account format.

Accounts are recorded as an `Array` of two `Value` variants, where the first element is a `variant { Blob = <owner principal> }`, representing the account owner, and the second element is a `variant { Blob = <subaccount> }`, representing the subaccount.

[marc0olo]

@bogwar provided some comments.