Move generic XML utils from @ui5-Lang-Assistant/logic-utils to XML-Tools/common

[bd82]

Some of the utilities in the logic-utils package are not specific to UI5 flows or structures.
These should be part of @xml-tools/common to avoid future duplication / re-implementation.

e.g:

• export function xmlToFQN(astElement: XMLElement): string;
• export function xmlClosingTagToFQN(astElement: XMLElement): string;
• export function splitQNameByNamespace( qName: string ): { prefix: string | undefined; localName: string };
• ...