Enhance scan script, split execute to smaller functions.

[duynguyenhoang]

Hello Soda team!

We are evaluating and adapting Soda as our main data quality tool. This is our first PR.

What include in the PR:

• Split execute function to smaller functions. It also helps us to write test easier.
• Allow us to calculate metrics value only without running validation. It is quite useful for us to do dry-run before actually validate data.

[CLAassistant]

All committers have signed the CLA.

[sonarcloud]

Quality Gate failed

Failed conditions

C Maintainability Rating on New Code (required ≥ A)

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[m1n0]

Hi! Thanks for the contribution! Could you please explain in a bit more detail how exactly this helps you? I get the split, but I would appreciate a bit more context and possibly a bit more thought into designing the split, thanks!