make random stream eps be query time settings

[lizhou1111]

this close #260

create random stream test22_create_random(id int default rand()%4) engine Random() settings eps=1000;
select count(1) from test22_create_random settings generate_eps=100;

If you set generate_eps in query time, it will use generate_eps as eps to generate data.
PR checklist:

• Did you run ClangFormat ?
• Did you separate headers to a different section in existing community code base ?
• Did you surround proton: starts/ends for new code in existing community code base ?

Please write user-readable short description of the changes: