add a query to get the current amount in the Treasury

[CarlosLopezDeLara]

Conway era brings the ability to make treasury donations. The process requires passing the current Treasury value as an argument, therefore it would be nice to have a dedicated query for getting that value, the only alternatives are querying the ledger state or getting it via another tool like dbsync.

i.e.

cardano-cli conway query treasury

This might need a new query in Consensus.

[github-actions]

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