Re-export public map types from root level

We currently have the `map` module private but containing a bunch of
types that are needed in the public API (specifically in a
`PartiallySignedTransaction`).

Re-export the publicly required types to the `psbt` module and then
again at the root level of `rust-bitcoin` as we do for other types.

Author: tcharding

src/lib.rs

@@ -139,6 +139,7 @@ pub use util::sighash::SchnorrSigHashType;
 pub use util::ecdsa::{self, EcdsaSig, EcdsaSigError};
 pub use util::schnorr::{self, SchnorrSig, SchnorrSigError};
 pub use util::key::{PrivateKey, PublicKey, XOnlyPublicKey, KeyPair};
+pub use util::psbt;
 #[allow(deprecated)]
 pub use blockdata::transaction::SigHashType;
 

src/util/psbt/mod.rs

@@ -39,7 +39,7 @@ mod macros;
 pub mod serialize;
 
 mod map;
-pub use self::map::{Input, Output, TapTree};
+pub use self::map::{Input, Output, TapTree, PsbtSigHashType};
 use self::map::Map;
 
 use util::bip32::{ExtendedPubKey, KeySource};