Add IRuntime interface (facebook#54923)

Summary:
Pull Request resolved: facebook#54923

After reviewing the feasibility of adding new Runtime functionality, we
realized the current state of `Runtime` makes it hard/inconvenient to
add new basic functionality. It requires creating a new interface (e.g.
`IRuntime2`) to declare the new APIs. Then, everywhere it is needed,
both the original `Runtime` and `IRuntime2` needs to passed in to access
both APIs.

After discussion, we decided to introduce `IRuntime`, which will declare
most of the `Runtime` functionalities. All "protected" APIs, which made
sense before interfaces were introduced, will now be public. The
protected static methods of `Runtime` will remain as is for the Friends
to access.

After we decided to cut "stable" (after incoming JSI improvements), new
functionalities will be added in `IRuntime2` interface. `IRuntime2` will
inherit `IRuntime` to make existing functionality easy to access.

Changelog: [Internal]

Reviewed By: lavenzg

Differential Revision: D89093651

Author: tsaichien

packages/react-native/ReactCommon/jsc/JSCRuntime.cpp

@@ -146,6 +146,10 @@ class JSCRuntime : public jsi::Runtime {
     friend class JSCRuntime;
   };
 
+  using IRuntime::getProperty;
+  using IRuntime::hasProperty;
+  using IRuntime::setPropertyValue;
+
   PointerValue* cloneSymbol(const Runtime::PointerValue* pv) override;
   PointerValue* cloneBigInt(const Runtime::PointerValue* pv) override;
   PointerValue* cloneString(const Runtime::PointerValue* pv) override;