feat!: improve wallet building methods

Remove returning `Result` for builder methods on `CreateParams` and
`LoadParams`.

example-crates/wallet_esplora_blocking/src/main.rs

@@ -4,7 +4,7 @@ use bdk_esplora::{esplora_client, EsploraExt};
 use bdk_wallet::{
     bitcoin::{Amount, Network},
     file_store::Store,
-    CreateParams, KeychainKind, LoadParams, SignOptions,
+    KeychainKind, SignOptions, Wallet,
 };
 
 const DB_MAGIC: &str = "bdk_wallet_esplora_example";
@@ -21,12 +21,15 @@ const ESPLORA_URL: &str = "http://signet.bitcoindevkit.net";
 fn main() -> Result<(), anyhow::Error> {
     let mut db = Store::<bdk_wallet::ChangeSet>::open_or_create_new(DB_MAGIC.as_bytes(), DB_PATH)?;
 
-    let load_params = LoadParams::with_descriptors(EXTERNAL_DESC, INTERNAL_DESC, NETWORK)?;
-    let create_params = CreateParams::new(EXTERNAL_DESC, INTERNAL_DESC, NETWORK)?;
-
-    let mut wallet = match load_params.load_wallet(&mut db)? {
+    let wallet_opt = Wallet::load()
+        .descriptors(EXTERNAL_DESC, INTERNAL_DESC)
+        .network(NETWORK)
+        .load_wallet(&mut db)?;
+    let mut wallet = match wallet_opt {
         Some(wallet) => wallet,
-        None => create_params.create_wallet(&mut db)?,
+        None => Wallet::create(EXTERNAL_DESC, INTERNAL_DESC)
+            .network(NETWORK)
+            .create_wallet(&mut db)?,
     };
 
     let address = wallet.next_unused_address(KeychainKind::External);