[iOS] Create new Swift Package Manager for GDataXMLDocument

Description

It's error-prone to add GDataXML (Objective-C) code to the project when we have conflicts in the xcodeproject.

Thus, the .m is missing from the project without warning. It crashes the app TWICE time.

Acceptance Criteria

• Bring this library to new SPM
• Integrate into the app

How to do it

1. Create an SPM with the name XMLParserSwift
2. Add two objective-c files GDataXMLNode.h and GDataXMLNode.m
3. Find a way to disable the ARC on file (GDataXMLNode.m) (ref: https://stackoverflow.com/questions/67803256/swift-package-manager-add-compile-flag-to-a-single-file-fno-objc-arc)

⚠️ GDataXMLNode.m requires -fno-objc-arc compile flag.

4. Add a Swift struct into this SPM, name: XMLParserSwift.swift
5. Add a static helper func:

static func prettyPrint(data: Data) -> String {
        guard let prettyXML = GDataXMLDocument.prettyPrintXMLData(data) else {
            return nil
        }
        return prettyXML
}

6. Verify we can build the SPM without error
7. Add this package to Proxyman iOS app
8. In Proxyman iOS project, remove GDataXMLNode.h and GDataXMLNode.m because we don't need it anymore
9. Open the class XMLParser and replace the old code with the new XMLParserSwift func.

How to test

1. Use HTTPBot to make a POST request, body = XML file, Header: Content-Type: application/xml
2. Open this request on Proxyman -> request -> Body -> Verify the app doesn't crash