Protocol 23 release candidate 2

This release is based on release 3.2.0-beta.1 and adds following fixes and improvements:

• extend soroban rpc GetEventsResponse with the fields latestLedgerCloseTime, oldestLedger and oldestLedgerCloseTime
• fix soroban rpc EventInfo by removing the field pagingToken
• extend soroban rpc EventInfo with the fields opIndexand txIndex
• the field inSuccessfulContractCall in EventInfo is now optional because it has been deprecated for protocol 23
• fix xdr parsing of SorobanTransactionMetaV2XDR