aya: add aya::maps::array and move ProgramArray under it

aya/src/maps/array/mod.rs

@@ -0,0 +1,4 @@
+//! Array types.
+mod program_array;
+
+pub use program_array::ProgramArray;

aya/src/maps/hash_map/hash_map.rs

@@ -1,4 +1,3 @@
-//! Hash map types.
 use std::{
     convert::TryFrom,
     marker::PhantomData,

aya/src/maps/hash_map/mod.rs

@@ -1,3 +1,4 @@
+//! Hash map types.
 use std::mem;
 
 use crate::{

aya/src/maps/mod.rs

@@ -40,15 +40,15 @@ use crate::{
     Pod,
 };
 
+pub mod array;
 pub mod hash_map;
 mod map_lock;
 pub mod perf;
-pub mod program_array;
 
+pub use array::ProgramArray;
 pub use hash_map::{HashMap, PerCpuHashMap};
 pub use map_lock::*;
 pub use perf::PerfEventArray;
-pub use program_array::ProgramArray;
 
 #[derive(Error, Debug)]
 pub enum MapError {