[JS] Serialization `toJSON` methods do not type check

[anna-dingler]

Platform

• JavaScript

Issue

The toJSON methods within serialization.ts are not properly checking the type of value. The parent class, PropertyDefinition, allows any as the value type, so typescript will allow any type to be passed to the overloaded methods on the child classes.

See this typescript example

Proposed solution:
Allow all methods to accept any for value and do additional checking within the methods.
See this PR (only some portions are relevant): #7762