Feature: Add Xml library

.chronus/changes/feature-xml-2024-2-20-16-48-57.md

@@ -0,0 +1,8 @@
+---
+# Change versionKind to one of: internal, fix, dependencies, feature, deprecation, breaking
+changeKind: internal
+packages:
+  - "@typespec/xml"
+---
+
+Initial release of xml library

.chronus/changes/feature-xml-2024-3-8-20-40-16.md

@@ -0,0 +1,8 @@
+---
+# Change versionKind to one of: internal, fix, dependencies, feature, deprecation, breaking
+changeKind: feature
+packages:
+  - "@typespec/compiler"
+---
+
+`getEncode` returns the fully equalied enum member name if using a custom enum.