Add public method to clear column filters

[christopher-carmichael]

Is your feature request related to a problem? Please describe.
I filter the ItemSource at the database level that is separate from the table grid. I already have a clear filter button that I want to also clear any tableview column filters to prevent confusion to the user.

Describe the solution you'd like
Add a public method to clear column filters on both the column objects as well as tableview control as a whole.

[w-ahmad]

This feature is similar to #30.