TBI - Extract XML writer from fiori-annotation-api to a separate package

[voicis]

Description (include screenshots)

In @sap-ux/fe-fpm-writer we need to update XML file content. Currently @xmldom/xmldom package is used, which is not aware of the existing formatting and just replaces the whole document, but that is not always desired. In @sap-ux/fiori-annotation-api we have an XML writer class which can do more fine grained changes and only update the required parts of the document. We should extract it into a separate package dedicated to writing into XML files, so it can be reused in other modules.

Value

Ability to reuse formatting and comment preserving XML writing APIs across tools.

Notes

XML writer https://github.com/SAP/open-ux-tools/blob/main/packages/fiori-annotation-api/src/xml/writer.ts
XML converter https://github.com/SAP/open-ux-tools/blob/main/packages/xml-odata-annotation-converter/src/printer/csdl-to-xml.ts

Tasks

• Create a new package (proposed name @sap-ux/xml-writer)
• Extract writer logic (change -> TextEdit)
• Extract converter logic (AST -> text)
• Refactor to remove the dependency to @sap-ux/odata-annotation-core-types
• Use the new package in @sap-ux/fe-fpm-writer