Add datetime length patterns as skeleta and fix non-Gregorian datagen (…

…#4915)

Part of #1317

This PR adds new skeleta `DayComponents::Auto`,
`DayComponents::AutoWeekday`, and `TimeComponents::Auto` with data
populated from the datetime length patterns.

It also fixes non-Gregorian neo skeleta datagen.

components/datetime/src/any/date.rs

@@ -38,7 +38,7 @@ size_test!(DateFormatter, date_formatter_size, 4456);
 /// # Examples
 ///
 /// ```
-/// use icu::calendar:: Date;
+/// use icu::calendar::Date;
 /// use icu::datetime::{options::length, DateFormatter};
 /// use icu::locid::locale;
 /// use writeable::assert_writeable_eq;

components/datetime/src/datetime.rs

@@ -801,7 +801,8 @@ where {
     /// ```
     /// use icu::calendar::Gregorian;
     /// use icu::datetime::{
-    ///     options::{components, length}, TypedDateTimeFormatter,
+    ///     options::{components, length},
+    ///     TypedDateTimeFormatter,
     /// };
     /// use icu::locid::locale;
     ///

components/datetime/src/format/neo.rs

@@ -1310,8 +1310,8 @@ impl<'a, C: CldrCalendar> DateTimePatternFormatter<'a, C> {
     /// # Examples
     ///
     /// ```
-    /// use icu::calendar::Time;
     /// use icu::calendar::Gregorian;
+    /// use icu::calendar::Time;
     /// use icu::datetime::fields::FieldLength;
     /// use icu::datetime::neo_pattern::DateTimePattern;
     /// use icu::datetime::TypedDateTimeNames;

components/datetime/src/lib.rs

@@ -144,6 +144,8 @@ pub mod input;
 #[cfg(feature = "experimental")]
 pub mod neo;
 #[cfg(feature = "experimental")]
+pub mod neo_marker;
+#[cfg(feature = "experimental")]
 pub mod neo_pattern;
 #[cfg(any(feature = "datagen", feature = "experimental"))]
 pub mod neo_skeleton;