getUI5NodeFromXMLElementNamespace utility may return a too wide "namespace" type

[bd82]

The namespace property returned is a BaseUI5Node, Should it be a plain UI5Namespace instead?

• https://github.com/SAP/ui5-language-assistant/blob/f2d29237e633cf30454f7ecba03fed1e940e999f/packages/logic-utils/api.d.ts#L152-L165

This is due to some possible edge cases that existed or may exist in the UI5 SDK.

• Some namespaces were mistakenly defined as an enum.
• In theory a UI5 Class may appear as a member of another UI5 Class (although no relevant instance is known).

Such a change may affect the behavior of some features, for example:

• Unknown namespace error in XMLView, how to treat a completely unknown namespace (foo.bar.x) versus a partially known but invalid namespace (sap.ui.core.x).

Relevant draft PR:

• https://github.com/SAP/ui5-language-assistant/pull/144