feat: re-export IndexMap (#1154)

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# Rationale for this change

It's a little easier to construct the `SchemaAccessorImpl` if the alias
type of the inner type is re-exported.

# What changes are included in this PR?

Making an alias reexport public

# Are these changes tested?
Not relevant.

Author: stuarttimwhite

crates/proof-of-sql/src/base/map.rs

@@ -1,5 +1,5 @@
-pub(crate) type IndexMap<K, V> =
-    indexmap::IndexMap<K, V, core::hash::BuildHasherDefault<ahash::AHasher>>;
+/// Alias for the `IndexMap` with a hash builder of type `BuildHasherDefault<AHasher>`
+pub type IndexMap<K, V> = indexmap::IndexMap<K, V, core::hash::BuildHasherDefault<ahash::AHasher>>;
 pub(crate) type IndexSet<T> = indexmap::IndexSet<T, core::hash::BuildHasherDefault<ahash::AHasher>>;
 
 /// Create an [`IndexMap`][self::IndexMap] from a list of key-value pairs

crates/proof-of-sql/src/base/mod.rs

@@ -26,6 +26,7 @@ pub mod scalar;
 mod serialize;
 pub(crate) use serialize::{impl_serde_for_ark_serde_checked, impl_serde_for_ark_serde_unchecked};
 pub(crate) mod map;
+pub use map::IndexMap;
 pub(crate) mod slice_ops;
 
 mod rayon_cfg;