Silence some warnings in xcode 13.3

Summary:
Silence some warnings in xcode 13.3 by explicitly defining some copy constructors in JSI and adding a compiler flag in Hermes.

Changelog:
[Internal][Fixed] - Build issues

Reviewed By: jpporto

Differential Revision: D34526541

fbshipit-source-id: 7029e3d20b9209007cf7e9f4c935338513ee1dd0

ReactCommon/jsi/jsi/jsi.h

@@ -1252,6 +1252,8 @@ class JSI_EXPORT JSIException : public std::exception {
   JSIException(std::string what) : what_(std::move(what)){};
 
  public:
+  JSIException(const JSIException&) = default;
+
   virtual const char* what() const noexcept override {
     return what_.c_str();
   }
@@ -1268,6 +1270,8 @@ class JSI_EXPORT JSINativeException : public JSIException {
  public:
   JSINativeException(std::string what) : JSIException(std::move(what)) {}
 
+  JSINativeException(const JSINativeException&) = default;
+
   virtual ~JSINativeException();
 };
 
@@ -1297,6 +1301,8 @@ class JSI_EXPORT JSError : public JSIException {
   /// but necessary to avoid ambiguity with the above.
   JSError(std::string what, Runtime& rt, Value&& value);
 
+  JSError(const JSError&) = default;
+
   virtual ~JSError();
 
   const std::string& getStack() const {