[Move] Implement Safeguard

[DayKev]

What are the changes?

Implements the move Safeguard.

Why am I doing these changes?

Implement more moves.

What did change?

Creates an ArenaTag used to implement the effects of Safeguard. Checks for the ArenaTag are implemented in ConfuseAttr and canSetStatus().

How to test the changes?

npm run test safeguard

Checklist

• [x] I'm using beta as my base branch
• [ ] There is no overlap with another PR?
  • Updated version of #3108
• [x] The PR is self-contained and cannot be split into smaller PRs?
• [x] Have I provided a clear explanation of the changes?
• [x] Have I considered writing automated tests for the issue?
• [x] Have I tested the changes (manually)?
  • [x] Are all unit tests still passing? (npm run test)
• ~[ ] Are the changes visual?~
  • ~[ ] Have I provided screenshots/videos of the changes?~