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/Runtime/Uint8ClampedArray.cpp

@@ -70,7 +70,10 @@ bool Uint8ClampedArray::put_by_index(i32 property_index, Value value, u8)
     // FIXME: Use attributes
     ASSERT(property_index >= 0);
     ASSERT(property_index < m_length);
-    m_data[property_index] = clamp(value.to_i32(), 0, 255);
+    auto number = value.to_i32(interpreter());
+    if (interpreter().exception())
+        return {};
+    m_data[property_index] = clamp(number, 0, 255);
     return true;
 }