bitcoin: Remove hash type re-exports

The `{W}PubkeyHash` and `{W}ScriptHash` types are not likely to be used
directly by consumers of the library because we have other function that
return them and are more ergonomic to use. There is therefor no good
reason to re-export them from the crate root.

bitcoin/examples/ecdsa-psbt-simple.rs

@@ -26,13 +26,14 @@ use std::collections::BTreeMap;
 
 use bitcoin::address::script_pubkey::ScriptBufExt as _;
 use bitcoin::bip32::{ChildNumber, DerivationPath, Fingerprint, IntoDerivationPath, Xpriv, Xpub};
+use bitcoin::key::WPubkeyHash;
 use bitcoin::locktime::absolute;
 use bitcoin::psbt::Input;
 use bitcoin::secp256k1::{Secp256k1, Signing};
 use bitcoin::witness::WitnessExt as _;
 use bitcoin::{
     consensus, transaction, Address, Amount, EcdsaSighashType, Network, OutPoint, Psbt, ScriptBuf,
-    Sequence, Transaction, TxIn, TxOut, Txid, WPubkeyHash, Witness,
+    Sequence, Transaction, TxIn, TxOut, Txid, Witness,
 };
 
 // The master xpriv, from which we derive the keys we control.

bitcoin/src/hash_types.rs

@@ -13,10 +13,9 @@ pub use crate::{
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::{
-        LegacySighash, PubkeyHash, ScriptHash, SegwitV0Sighash, TapSighash, WPubkeyHash,
-        WScriptHash, XKeyIdentifier,
-    };
+    use crate::key::{PubkeyHash, WPubkeyHash};
+    use crate::script::{ScriptHash, WScriptHash};
+    use crate::{LegacySighash, SegwitV0Sighash, TapSighash, XKeyIdentifier};
 
     #[rustfmt::skip]
     /// sha256d of the empty string

bitcoin/src/lib.rs

@@ -144,9 +144,7 @@ pub use crate::{
     bip158::{FilterHash, FilterHeader},
     bip32::XKeyIdentifier,
     crypto::ecdsa,
-    crypto::key::{
-        self, CompressedPublicKey, PrivateKey, PubkeyHash, PublicKey, WPubkeyHash, XOnlyPublicKey,
-    },
+    crypto::key::{self, CompressedPublicKey, PrivateKey, PublicKey, XOnlyPublicKey},
     crypto::sighash::{self, LegacySighash, SegwitV0Sighash, TapSighash, TapSighashTag},
     merkle_tree::MerkleBlock,
     network::params::{self, Params},
@@ -163,7 +161,6 @@ pub use crate::{
     blockdata::locktime::{absolute, relative},
     blockdata::script::witness_program::{self, WitnessProgram},
     blockdata::script::witness_version::{self, WitnessVersion},
-    blockdata::script::{ScriptHash, WScriptHash}, // TODO: Move these down below after they are in primitives.
     // These modules also re-export all the respective `primitives` types.
     blockdata::{
         block, constants, fee_rate, locktime, opcodes, script, transaction, weight, witness,