fix: parsing of qualifiers with colons

[mateusnr]

The way column qualifiers are being parsed atm doesn't take into account those containing colon characters.

E.g.: given a column name abc:def:ghi, columnFilter() throws a bad format for column message, instead of returning a filter chain of abc and def:ghi

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.