fix(query): fix the crash caused by the complex having clause

enh(rpc): add rpc retry

fix: fix memory leak in client

feat: SKVRow read logic

refactor(query): refactor cast function

fix(query): fix timezone function with trailing characters

test: add cast and varchar case

fix(query): fix the crash caused by the complex having clause in which an scalar function is nested with an aggregate function in group by query.

TD-14837
TD-14843
TD-14904

TD-14837
TD-14843
TD-14904

TD-14837
TD-14843
TD-14904

fix: make taos_options work

feat(udf): UDF service refactoring with new interface

feat(query): a new builtin aggregate function is added.