add hash query

Summary:
add TransactionCount/GetTransactions
增加关于 transaction/block 相关的查询接口

Test Plan: none

Reviewers: nex, wuyi

Reviewed By: nex

Differential Revision: https://phabricator.internetapi.cn/D25

gen-go.bat

@@ -12,6 +12,6 @@ if not exist %dir% mkdir %dir%
 %exe% -I . --go_out=plugins=grpc:%dir% bdledger/api/common.proto
 %exe% -I . --go_out=plugins=grpc:%dir% bdledger/api/error_details.proto
 %exe% -I . --go_out=plugins=grpc:%dir% bdledger/api/tx_ledger.proto
-%exe% -I . --go_out=plugins=grpc:%dir% bdledger/api/ac_chain.proto
+%exe% -I . --go_out=plugins=grpc:%dir% bdledger/api/query_service.proto
 
 echo all done