refactor!(chain): Unify ChangeSet nomenclature

This commit renames:

- indexed_tx_graph::IndexedAdditions -> indexed_tx_graph::ChangeSet
- indexed_tx_graph::IndexedAdditions::graph_additions -> indexed_tx_graph::ChangeSet::graph
- indexed_tx_graph::IndexedAdditions::index_additions -> indexed_tx_graph::ChangeSet::indexer
- tx_graph::Additions -> tx_graph::ChangeSet
- keychain::DerivationAdditions -> keychain::ChangeSet
- CanonicalTx::node -> CanonicalTx::tx_node
- CanonicalTx::observed_as -> CanonicalTx::chain_position
- LocalChangeSet -> WalletChangeSet
- LocalChangeSet::chain_changeset -> WalletChangeSet::chain
- LocalChangeSet::indexed_additions -> WalletChangeSet::indexed_tx_graph
- LocalUpdate -> WalletUpdate

This commit also changes the visibility of TxGraph::determine_changeset
to be pub(crate), and the method accepts a TxGraph instead of &TxGraph

This commit removes:
- `TxGraph::insert_txout_preview`
- `TxGraph::insert_tx_preview`
- `insert_anchor_preview`
- `insert_seen_at_preview`

Solves #1022

example-crates/wallet_esplora_async/src/main.rs

@@ -2,7 +2,7 @@ use std::{io::Write, str::FromStr};
 
 use bdk::{
     bitcoin::{Address, Network},
-    chain::keychain::LocalUpdate,
+    chain::keychain::WalletUpdate,
     wallet::AddressIndex,
     SignOptions, Wallet,
 };
@@ -59,10 +59,10 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
         .await?;
     let missing_heights = wallet.tx_graph().missing_heights(wallet.local_chain());
     let chain_update = client.update_local_chain(prev_tip, missing_heights).await?;
-    let update = LocalUpdate {
+    let update = WalletUpdate {
         last_active_indices,
         graph: update_graph,
-        ..LocalUpdate::new(chain_update)
+        ..WalletUpdate::new(chain_update)
     };
     wallet.apply_update(update)?;
     wallet.commit()?;