Rejig LogStringHandler

[ElectroJr]

This PR reworks parts of admin logging and LogStringHandler, both to make it slightly nicer to use, and to remove some unnecessary component queries. The main change is that a lot of the processing that was happening in AdminLogManager.ToJson() is now done in the string interpolation handler (LogStringHandler).

Also fixes #31531

Changes:

• The handler now automatically uses ToPrettyString() when given an entity. I.e., $"{ToPrettyString(user):user} interacted with {ToPrettyString(target):target}" can now be replaced with $"{user} interacted with {target}".
• The handler now recognises NetEntity and objects that implement IAsType<EntityUid> as entities. This means that Entity<T1,T2..> should be recognized as entities once they are given the IAsType interface (which is included in Toolshed Rejig RobustToolbox#5455)
• Components no longer work as references to an entity (Component.Owner is obsolete).
• Changed some json serializers:
  • Removed SerializableEntityCoordinates and replaced the json converter with something that just directly uses EntityCoordinates. I'm not really sure why this struct even existed.
  • The SerializablePlayer struct was moved from a sever-side to a shared namespace
  • I'm not sure how the admin log tools work, so I'm not sure if these changes could somehow causes issues

[github-actions]

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