Improve update_column validation for pii attribute

[npatki]

For SDV 1.0 (in progress)

Problem Description

The update_column method is used to update parts of the metadata that may be incorrect. This method should also do some validation to make sure the user does not provide invalid data (that will cause issues later).

When passing in pii, the method currently accepts any input:

metadata.update_column(
    'column_name': 'user_address',
    'sdtype': 'address',
    'pii': 'a_string_input_type'

Or

metadata.update_column(
    'column_name': 'user_address',
    'sdtype': 'address',
    'pii': 40.0

**

Expected behavior

Only True and False values are allowed for the pii attribute. If the user passes in an incorrect value, we should throw an error.

InvalidMetadataError: Parameter 'pii' is set to an invalid attribute (40.0). Expected a value of True or False.