QMetaObject: add overloads that take a view instead of `const char *`

QTBUG-133234 talks about fixing build issues when QT_NO_CAST_FROM_BYTEARRAY is defined. A lot of places in qtdeclarative rely on the QByteArray -> `const char *` implicit conversion when calling QMetaObject's functions, indexOfProperty() and co.

The build can be fixed by appending `.constData()` in those method calls, but that is a lot of churn. It would be simpler to add overloads to QMetaObect that take a view, then the build issues will disappear.

There was a previous trial, see the chain starting with https://codereview.qt-project.org/c/qt/qtbase/+/514588, to add such overloads, but it got stuck on deciding which view type to use:

• QByteArrayView: best candidate
• QUtf8StringView: missing some API, e.g. indexOf(), so can be in the public API, but internally it'll have to be QBAV
• QAnyStringView: can accept various types of strings, UTF16/8, but some developers thought it's overkill for QMetaObject, where the method names are typically ASCII and rarely Utf8