Set table properties with dictionary

[kevinjqliu]

Resolves #502

This PR modifies the Transactions set_properties API to allow passing table properties either as dictionary or as kwargs
For example,

with table.transaction() as transaction: 
    transaction.set_properties(abc="def")
    transaction.set_properties({"abc": "def"}) 

set_properties only allows table properties to be passed in either via dictionary or kwarg, not both. This removes complexity when both are set.

[HonahX]

LGTM! Thanks @kevinjqliu !