feat: Added method Exiled.API.Features.Map.Clean

[Num10ck]

Description

Describe the changes
Added a method Exiled.API.Features.Map.Clean designed to cleanup specified Decals.DecalPoolType.

What is the current behavior? (You can also link to an open issue here)
There are no methods (or these method not in Exiled.API.Features.Map) for cleaning up decals.

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

Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)
This PR introduces only methods and using directives.

Other information:
Probably not cleaning the glass (DecalPoolType.GlassCrack) (at least in the SCP-330 chamber).

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

[Num10ck]

Also I think it would be useful to copy DecalPoolType to new enum with FlagsAttribute and rename this method to CleanDecals

[Num10ck]

It looks like I accidentally committed a fix for the RA command in this PR

[louis1706]

It looks like I accidentally committed a fix for the RA command in this PR

so what will you do ?

[Num10ck]

It looks like I accidentally committed a fix for the RA command in this PR

so what will you do ?

Idk what to do. This is my first PR.

[Num10ck]

I have to somehow exclude the last two commits from here

[Num10ck]

Is there anything else I need to do in this PR?