Create a Hijri module and move hijri_ummalqura_data to it (#6521)

As #6502 (comment)

Author: ebraminio

components/calendar/src/cal/hijri.rs

@@ -19,7 +19,6 @@
 //! assert_eq!(hijri_date.day_of_month().0, 11);
 //! ```
 
-use crate::cal::hijri_ummalqura_data::{UMMALQURA_DATA, UMMALQURA_DATA_STARTING_YEAR};
 use crate::cal::iso::{Iso, IsoDateInner};
 use crate::calendar_arithmetic::PrecomputedDataSource;
 use crate::calendar_arithmetic::{ArithmeticDate, CalendarArithmetic};
@@ -34,6 +33,9 @@ use calendrical_calculations::rata_die::RataDie;
 use icu_provider::marker::ErasedMarker;
 use icu_provider::prelude::*;
 use tinystr::tinystr;
+use ummalqura_data::{UMMALQURA_DATA, UMMALQURA_DATA_STARTING_YEAR};
+
+mod ummalqura_data;
 
 fn era_year(year: i32) -> EraYear {
     types::EraYear {

components/calendar/src/cal/hijri_ummalqura_data.rs renamed to components/calendar/src/cal/hijri/ummalqura_data.rs

@@ -12,7 +12,6 @@ pub(crate) mod ethiopian;
 pub(crate) mod gregorian;
 pub(crate) mod hebrew;
 pub(crate) mod hijri;
-mod hijri_ummalqura_data;
 pub(crate) mod indian;
 pub(crate) mod iso;
 pub(crate) mod japanese;