feat: Support writing Time type in json

[mcrumiller]

Closes #21452.

I also removed two small branches that aren't relevant to Polars:

1. ArrowDataType::Timestamp(s) - this is our Datetime dtype, which only uses ms, us, and ns, we have no s implementation.
2. ArrowDataType::Duration(s) - same as Datetime units described above.

[codecov]

Codecov Report

Attention: Patch coverage is 87.09677% with 4 lines in your changes missing coverage. Please review.

Project coverage is 79.99%. Comparing base (5b48926) to head (e8821c6).
Report is 17 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/polars-json/src/json/write/serialize.rs	87.09%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #21454      +/-   ##
==========================================
+ Coverage   79.96%   79.99%   +0.02%     
==========================================
  Files        1597     1598       +1     
  Lines      229115   229228     +113     
  Branches     2618     2620       +2     
==========================================
+ Hits       183222   183381     +159     
+ Misses      45294    45248      -46     
  Partials      599      599              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[ritchie46]

We only use one of time32 / time64 in Polars. (I don't know on top of head which one, but we only should implement and compile one)(

[mcrumiller]

Thanks, I wasn't sure of this since the Duration writer above has branches for time units that we don't use. I'll remove time32.

[ritchie46]

Thanks, I wasn't sure of this since the Duration writer above has branches for time units that we don't use.

Ah, then we can remove those as well. :) Can you do that?

[mcrumiller]

Yup. Drafting because I'm at work so no local CI so I'm relying on GitHub to help me lint/format.

[mcrumiller]

Ok yeah this will have to wait until tonight.

[mcrumiller]

@ritchie46 I noticed that we have a few other functions in polars-arrow that correspond to dtype+time unit combinations that polars doesn't support in other areas unrelated to json. I wonder if these were included for potential future support, e.g. Datetime(s). I can maybe remove those in another PR?

[ritchie46]

I wonder if these were included for potential future support, e.g. Datetime(s). I can maybe remove those in another PR?

No, that's what's leftover from arrow2. We don't need it in Polars, so it can be removed.