Added a BanManager

[Mikihero]

Description

Describe the changes
Added a BanManager which lets you ban offline users and unban players without using Server.ExecuteCommand()

What is the current behavior? (You can also link to an open issue here)
N/A

What is the new behavior? (if this is a feature change)
N/A

Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)
no

Other information:
There really isn't much to test here so I didn't bother, it's just adapted base game code.

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

[VALERA771]

Will be also good if we can specify a nickname of issuer

[Mikihero]

Will be also good if we can specify a nickname of issuer

done