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ARROW-15783: [Python] Initialize static pandas data on write

I'm not sure if this is the best place to ensure we always set this, but it seemed reasonable, happy to change it.

The underlying issue is this was the first type were we required C++ code for writing pandas data.

Closes #12753 from emkornfield/interval_conversion

Lead-authored-by: emkornfield <emkornfield@gmail.com>
Co-authored-by: Micah Kornfield <micahk@google.com>
Signed-off-by: Joris Van den Bossche <jorisvandenbossche@gmail.com>