implement config option "excludedPatternTags"

[thethomic]

I am using Pattern Lab Node v3.0.4 on Windows, with Node v12.12.0, using a Gulp Edition.

Issue Description

The option excludedPatternTags in the patterlab-config.json so far has no effect at all.

The function is described here very briefly.
I assume the behavior is supposed to be the same as the excludedPatternStates:

• states are defined in a patterns documentation file like state: incomplete
• tags has to be an array, like tags: [new, relaunch, dev]

Expected Behavior

Adding the option excludedPatternTags in the patterlab-config.json has an effect on the output of a build process.
As with the excludedPatternStates pages should be completely excluded from a build if one of the by documentation file assigned tags matches one of the excludedPatternTags.

Actual Behavior

Using the option excludedPatternTags has no effect

Steps to Reproduce

Use the option excludedPatternTags, build a lab