missing_presence_validation: ignore columns with defaults

[fatkodima]

Fixes #170.

We can add a flag for this behaviour to the checker, but I do not think this will be needed, as this looks like a legit use case for all the cases.

[mhenrixon]

Cheers! Much appreciated

[gregnavis]

I'd like to support @mhenrixon's use case, but at the same time I wouldn't like to force that on other users (including myself!). I suggest we add a new setting to missing_presence_validation such that:

1. A non-global setting ignore_columns_with_default.
2. The value of the new setting should be set to false to avoid breaking backwards compatibility.
3. If the setting is true then we should get the behavior suggested by @mhenrixon; if it's false then we should get the old behavior.

Does that make sense, @mhenrixon, @fatkodima? Let me know if I mixed something up -- I'm terribly under-slept today.

[mhenrixon]

Does that make sense, @mhenrixon, @fatkodima? Let me know if I mixed something up -- I'm terribly under-slept today.

Sounds phenomenal @gregnavis! I can relate to the undersleeping 😩

[fatkodima]

Updated PR with ignore_columns_with_default new config option.

[gregnavis]

Merged! Thank you @fatkodima and @mhenrixon. 🙇🏻