Support comma in tag values through cli flag

[mstoykov]

What?

Support setting tags which values contain commas through cli flags

Why?

It seems very strange that this isn't supported at all on the cli, but you can do it through options.

This is a breaking change as before you can do --tag one=value,two=value which will produce 2 flags one with key one, the other with two.

This will now produce only 1 tag.

I would argue though that the alternative is to forbid commas in the values. And that seems like a bigger breaking change.

Given our documentation and help we have never documented that you can put two tags with the same flag, so 🤷

Checklist

• I have performed a self-review of my code.
• I have added tests for my changes.
• I have run linter locally (make lint) and all checks pass.
• I have run tests locally (make tests) and all tests pass.
• I have commented on my code, particularly in hard-to-understand areas.

Related PR(s)/Issue(s)

[inancgumus]

Producing one tag sounds more intuitive.