switch from xmlbuilder2 to fast-xml-parser

[bhovhannes]

Switching to better maintained xml parser/serializer library.

[bhovhannes]

This is released as version 10.0.0-0 in case someone wants to try.

[codecov]

Codecov Report

❌ Patch coverage is 95.29412% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.72%. Comparing base (c02b221) to head (d616413).

Files with missing lines	Patch %	Lines
src/mergeToString.js	95.29%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              main     #415      +/-   ##
===========================================
- Coverage   100.00%   91.72%   -8.28%     
===========================================
  Files            6        6              
  Lines          107      145      +38     
===========================================
+ Hits           107      133      +26     
- Misses           0       12      +12     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.