Text Descriptors Customisation for Text-specific Metrics and Preset

Updates:

1. Added text descriptor TriggerWordsPresence
2. Added an option to specify which text descriptors should be used in the following metrics:

• TextDescriptorsDriftMetric
• TextDescriptorsDistribution
• TextDescriptorsCorrelationMetric

3. Added an option to specify which text descriptors should be used in the TextOverviewPreset

Fixes:
#512
#519
#520
#521
#522