feat: add IsOptedOutOfScp getter to Player class

[reversum]

Description

Describe the changes
add IsOptedOutOfScp getter for checking if player has opt out of scp enabled

What is the current behavior?
You need to use the ScpPlayerPicker class from the Assembly to check if a player is opted out

What is the new behavior?
You can directly check if a player is opted out in the Exiled.API.Features.Player class with IsOptedOutOfScp

Does this PR introduce a breaking change?
No

Other information:

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentations

Submission checklist

• I have checked the project can be compiled
• I have tested my changes and it worked as expected

Patches (if there are any changes related to Harmony patches)

• I have checked no IL patching errors in the console

Other

• Still requires more testing

[reversum]

there is already Player ScpPreferences.OptOutOfScp