LibJS: Pass Interpreter& to Value::to_number() et al.

This patch is unfortunately rather large and might make some things feel
bloated, but it is necessary to fix a few flaws in LibJS, primarily
blindly coercing values to numbers without exception checks - i.e.

interpreter.argument(0).to_i32();  // can fail!!!

Some examples where the interpreter would actually crash:

var o = { toString: () => { throw Error() } };
+o;
o - 1;
"foo".charAt(o);
"bar".repeat(o);

To fix this, we now have the following...

to_double(Interpreter&)
to_i32()
to_i32(Interpreter&)
to_size_t()
to_size_t(Interpreter&)

...and a whole lot of exception checking.

There's intentionally no to_double(), use as_double() directly instead.

This way we still can use these convenient utility functions but don't
need to check for exceptions if we are sure the value already is a
number.

Fixes #2267.

Libraries/LibJS/AST.cpp

@@ -941,11 +941,12 @@ Value UpdateExpression::execute(Interpreter& interpreter) const
     auto reference = m_argument->to_reference(interpreter);
     if (interpreter.exception())
         return {};
-
     auto old_value = reference.get(interpreter);
     if (interpreter.exception())
         return {};
-    old_value = old_value.to_number();
+    old_value = old_value.to_number(interpreter);
+    if (interpreter.exception())
+        return {};
 
     int op_result = 0;
     switch (m_op) {