editor: added support for default text direction

[luis-411]

Addresses: #4654

Added option in editor settings to enable different text directions by default

[thecodrr]

This won't work because changing the default text direction also changes the direction of all the paragraphs old and new. This is probably not the expected behavior. We want the text written when default text direction is RTL to remain RTL even if we switch to LTR later on.

[luis-411]

This approach seems promising, but it does not work yet, because when performing this:
editorContainer.style.direction = useEditorStore.getState().getActiveSession()?.textDirection || "ltr";
the value of useEditorStore.getState().getActiveSession()?.textDirection is always undefined.
Other values like title are undefined as well. I think I have to maybe use a different function to get the value correctly. Do you have an idea of what is wrong here?