respect roundtrip by sorting keys

Author: cscheid

crates/quarto-markdown-pandoc/tests/roundtrip_tests/qmd-json-qmd/metadata_mixed.qmd

@@ -1,14 +1,14 @@
 ---
-title: Test Document
 draft: true
+settings:
+  number-sections: false
+  toc: true
 tags:
   - science
   - research
-settings:
-  toc: true
-  number-sections: false
+title: Test Document
 ---
 
-# Introduction
+# Introduction {#introduction}
 
-This is a test document.
+This is a test document.

crates/quarto-markdown-pandoc/tests/roundtrip_tests/qmd-json-qmd/metadata_nested.qmd

@@ -4,4 +4,4 @@ author:
   affiliation: Example University
 ---
 
-# Test Document
+# Test Document {#test-document}