feat(wasm-utxo): export sighash and consensus branch getters

Export `get_sighash_fork_id` and `get_zec_consensus_branch_id` from
the bitgo_psbt module for external use. Add `as_str` method to
`ScriptType` enum for string representation.

Co-authored-by: llm-git <llm-git@ttll.de>

Author: OttoAllmendinger

packages/wasm-utxo/src/fixed_script_wallet/bitgo_psbt/mod.rs

@@ -17,8 +17,11 @@ pub mod zcash_psbt;
 use crate::Network;
 pub use dash_psbt::DashBitGoPsbt;
 use miniscript::bitcoin::{psbt::Psbt, secp256k1, CompressedPublicKey, Txid};
-pub use propkv::{find_kv, BitGoKeyValue, ProprietaryKeySubtype, WasmUtxoVersionInfo, BITGO};
-pub use sighash::validate_sighash_type;
+pub use propkv::{
+    find_kv, get_zec_consensus_branch_id, BitGoKeyValue, ProprietaryKeySubtype,
+    WasmUtxoVersionInfo, BITGO,
+};
+pub use sighash::{get_sighash_fork_id, validate_sighash_type};
 pub use zcash_psbt::{
     decode_zcash_transaction_meta, ZcashBitGoPsbt, ZcashTransactionMeta,
     ZCASH_SAPLING_VERSION_GROUP_ID,

packages/wasm-utxo/src/fixed_script_wallet/bitgo_psbt/psbt_wallet_input.rs

@@ -803,6 +803,19 @@ impl InputScriptType {
             }
         }
     }
+
+    pub fn as_str(self) -> &'static str {
+        match self {
+            Self::P2shP2pk             => "p2shP2pk",
+            Self::P2sh                 => "p2sh",
+            Self::P2shP2wsh            => "p2shP2wsh",
+            Self::P2wsh                => "p2wsh",
+            Self::P2trLegacy           => "p2trLegacy",
+            Self::P2trMusig2KeyPath    => "p2trMusig2",
+            Self::P2trMusig2ScriptPath => "p2trMusig2Script",
+            Self::P2mr                 => "p2mr",
+        }
+    }
 }
 
 /// Parsed input from a PSBT transaction