fix(rust,python): ensure trailing quote is written for temporal data when CSV quote_style is non-numeric

[alexander-beedie]

Closes #11324.

We missed writing the trailing quote for datetime values in CSV output when quote_style was "non_numeric". Fixed, and extended the related test-coverage to include date/datetime values.

Example

import polars as pl
from datetime import datetime
df = pl.DataFrame({"dtm": [datetime.now(), datetime.now()]})

Before

(datetime values are missing trailing quotes)

print( df.write_csv( has_header=True, quote_style = 'non_numeric') )
# "dtm"
# "2023-09-26T11:59:34.345885
# "2023-09-26T11:59:34.345931

After

print( df.write_csv( has_header=True, quote_style = 'non_numeric') )
# "dtm"
# "2023-09-26T11:59:34.345885"
# "2023-09-26T11:59:34.345931"

[stinodego]

Good to go if CI passes 👍

[alexander-beedie]

Good to go if CI passes 👍

Lint isn't happy - will take a look.
Update: got it...