feat: refactor macro implementation

[Kolos65]

This PR refactors the complete macro implementation to improve code quality and reduce code duplications.

Key features of the new macro implementation are the following:

• Added 3 protocols to encapsulate common syntax generation requirements:
  • Buildable for the generation of return, action and verify builder struct members
  • Caseable to help requirement - enum case association
  • Mockable to encapsulate the generation of mock implementations
• Refactored generators into Factory enums with static build functions
• Moved all syntax related helpers into appropriate extensions
• Removed all string literals so all members are created using pure SwiftSyntax