[Move] Implement Electrify

[innerthunder]

What are the changes the user will see?

This implements the move Electrify.

Why am I making these changes?

More implementations are good, and this isn't much different from Plasma Fists, which I just implemented.

What are the changes from a developer perspective?

• data/battler-tags: New ELECTRIFIED tag converts the tag holder's moves to Electric type for the rest of the turn.
• data/move: Electrify now uses an AddBattlerTagAttr to add an ELECTRIFIED tag to the target.
• field/pokemon: getMoveType now returns Type.ELECTRIC when the Pokemon has an ELECTRIFIED tag (this applies after move-type-changing abilities like Pixilate).

Screenshots/Videos

How to test the changes?

npm run test electrify (2 new tests)

Checklist

• I'm using beta as my base branch
• There is no overlap with another PR?
• The PR is self-contained and cannot be split into smaller PRs?
• Have I provided a clear explanation of the changes?
• Have I considered writing automated tests for the issue?
• If I have text, did I make it translatable and add a key in the English locale file(s)?
• Have I tested the changes (manually)?
  • Are all unit tests still passing? (npm run test)
• Are the changes visual?
  • Have I provided screenshots/videos of the changes?