[YCQL] Support for tuples

[frozenspider]

Jira Link: DB-4693
Right now, tuple is not even a reserved name and is treated as a missing UDT:

cqlsh> CREATE TABLE k.test(k int PRIMARY KEY, t tuple<int, text>);
SyntaxException: Query error: Invalid SQL Statement. syntax error, unexpected '<', expecting ')'
CREATE TABLE k.test(k int PRIMARY KEY, t tuple<int, text>);
                                              ^
 (error -11)

cqlsh> CREATE TABLE k.test(k int PRIMARY KEY, t tuple);
InvalidRequest: Error from server: code=2200 [Invalid query] message="Query error: Type Not Found. Could not find user defined type
CREATE TABLE k.test(k int PRIMARY KEY, t tuple);
                                         ^^^^^
 (error -311)"