Add batch revocation

[mirgee]

Adds API to revoke credentials locally (saving / merging revocation registry entry to the wallet) and publish revocation registry entry to the ledger (i.e. make all revocations revoked locally public).

Tested for both V2 and V3 (V3 with #2148 and #2112 merged in).

Signed-off-by: Miroslav Kovar [email protected]