Add Johto safari zone encounters

[Machine-Maker]

Change description

Adds gen iv Johto safari zone encounters
Closes #1522

AI coding assistance disclosure

Claude helped

Contributor check list

• I have written a description of the contribution and explained its motivation.
• I have written tests for my code changes (if applicable).
• I have read and understood the AI Assisted Contribution guidelines.
• I will own this change in production, and I am prepared to fix any bugs caused by my code change.

[jemarq04]

Can you provide more of a description to what you're adding? What I'm reading on Bulbapedia does not match what you're adding here.

For example, Fearow isn't available in johto-safari-zone-peak unless there are 5 Forest block objects placed in it, according to Bulbapedia. However, this PR just adds a johto-safari-displaced with prose "Displaced by block-based encounter". This doesn't seem very clear to me (and I'm not sure what is even meant by "displaced").

Some encounters require multiple types of blocks, so maybe something more reasonable would be a set of encounter conditions - one for each type of block object that would need to be placed. Then a set of relevant condition values would be added (e.g. a johto-safari-forest-block condition with a johto-safari-forest-block-5 condition value for Fearow's, or something like this). I think this would make things a lot clearer as to how we would encounter these pokemon in the area

Also.. "Claude helped" is not much of a description for how you used AI to aid this PR. You've added a lot of helpful encounters we've missed, so thank you for that, but please try to be descriptive in these descriptions so we know what we're reviewing