Add support for ability-based damage bonus mechanic

[bcollazo]

Summary

Implement support for attack mechanics that deal extra damage when the opponent's Active Pokémon has an Ability.

Key Changes

• Added new ExtraDamageIfOpponentActiveHasAbility variant to the Mechanic enum with configurable extra_damage parameter
• Implemented extra_damage_if_opponent_active_has_ability() function that:
  • Checks if the opponent's Active Pokémon has an Ability
  • Returns base damage + extra damage if ability is present, otherwise returns base damage only
• Added forecast effect handler in forecast_effect_attack_by_mechanic() to process this mechanic during attack resolution
• Mapped the game text "If your opponent's Active Pokémon has an Ability, this attack does 40 more damage." to the new mechanic in the effect mechanic map

Implementation Details

The implementation follows the existing pattern used for similar conditional damage mechanics (e.g., ExtraDamageIfOpponentHpMoreThanSelf). The ability check uses the card's get_ability() method to determine if an Ability is present on the opponent's Active Pokémon.

https://claude.ai/code/session_01D9WZtbdn3onfUqkzmGS4H1