support balance data reset plan (#463)

src/executor/CMakeLists.txt

src/executor/Executor.cpp

src/executor/admin/BalanceExecutor.cpp

src/executor/admin/ResetBalanceExecutor.cpp

src/executor/admin/ResetBalanceExecutor.h

src/executor/admin/StopBalanceExecutor.cpp

src/parser/AdminSentences.h

src/parser/parser.yy

src/parser/scanner.lex

src/parser/test/ParserTest.cpp

src/parser/test/ScannerTest.cpp

src/planner/Admin.h

src/planner/PlanNode.cpp

src/planner/PlanNode.h

src/validator/BalanceValidator.cpp