Implement tokens support

Problem/Motivation

User should be able to use tokens when configuring segments.

Steps to reproduce

Proposed resolution

AIPromptSegmentBase should provide tokens, as well as, provide ability for extending classes to replace tokens with values on the chosen fields.

Remaining tasks

1. Update API with tokens support
2. Update 'Text' segment type with token module support.
3. Update 'Views' segment type with token module support: view_id, display_id, arguments and parameters should all support tokens.

User interface changes

API changes

Data model changes