Feature/issue 297 random stream supports slow eps

[lizhou1111]

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:

1. Random stream supports slow eps, such as settings eps = 0.5 means every 2 second generating 1 data.

timeplus-OptiPlex-7000 :) select *,now() from test_random settings eps=0.5

SELECT
  *, now()
FROM
  test_random
SETTINGS
  eps = 0.5

Query id: 17a2b923-6027-4d8c-b18d-f3fe1a2d0581

┌──────────id─┬────────────────_tp_time─┬───────────────now()─┐
│ -1035862218 │ 2024-01-19 10:17:28.813 │ 2024-01-19 18:17:28 │
└─────────────┴─────────────────────────┴─────────────────────┘
┌────────id─┬────────────────_tp_time─┬───────────────now()─┐
│ 256839792 │ 2024-01-19 10:17:30.804 │ 2024-01-19 18:17:30 │
└───────────┴─────────────────────────┴─────────────────────┘

2. refactor RandomSource, the former code are hard to read and maintain.

[yl-lisen]

good work, it's easy to understand.