Add more collator data and filtering to testdata; add transliterator attributes domain

components/decimal/src/provider.rs

@@ -157,7 +157,7 @@ icu_provider::data_marker!(
 );
 
 icu_provider::data_marker!(
-    /// The digits for a given numbering system. This data ought to be stored in the `und` locale with an auxiliary key
+    /// The digits for a given numbering system. This data ought to be stored in the `und` locale with a marker attribute
     /// set to the numbering system code.
     DecimalDigitsV1,
     "decimal/digits/v1",

components/experimental/src/transliterate/provider.rs

@@ -38,6 +38,8 @@ icu_provider::data_marker!(
     RuleBasedTransliterator<'static>,
     #[cfg(feature = "datagen")]
     expose_baked_consts = true,
+    #[cfg(feature = "datagen")]
+    attributes_domain = "transliterator",
 );
 
 /// The data struct representing [UTS #35 transform rules](https://unicode.org/reports/tr35/tr35-general.html#Transforms).