support arithmetic operators

[tswast]

Similar to #78, most (all?) arithmetic operator compliance tests are failing.

The list of arithmetic operators is available at:

https://github.com/pandas-dev/pandas/blob/5b2fb093f6abd6f5022fe5459af8327c216c5808/pandas/conftest.py#L911-L934

Looking at this list, I'm not certain that it makes sense to support any of these? Maybe subtraction to create timedelta values?

[chalmerlowe]

Closing as will not work. Efforts going forward are focused on more fully interacting with ArrowDtype.