internal: support both server-side and client-side objects in wip_sp3.js

[Pospelove]

[!IMPORTANT] Adds assign function in wip_sp3.js to support server-side and client-side object properties, updating constructors and methods to use it.

• Behavior:
  • Introduces assign function in wip_sp3.js to handle server-side and client-side object properties.
  • assign function checks for desc and type for server-side objects, and _skyrimPlatform_indexInPool for client-side objects.
  • Replaces direct property assignments with assign in createSkyrimPlatform() for constructors and methods.
• Functions:
  • Modifies createSkyrimPlatform() to use assign for resWithClass in constructors and methods.
  • Updates from method to use assign for object conversion.
• Misc:
  • Removes redundant property assignments in favor of assign function.

^{This description was created by for fe634c126a094e3c5f812d1d3e47a1aad697c2ee. It will automatically update as commits are pushed.}