[bdk_chain_redesign] Test LocalChain

This is mostly copying over the relevant tests from `SparseChain`.
Changes are made to `local_chain::ChangeSet` to re-add the ability to
remove blocks.

crates/chain/tests/common/mod.rs

@@ -5,6 +5,14 @@ macro_rules! h {
     }};
 }
 
+#[allow(unused_macros)]
+macro_rules! local_chain {
+    [ $(($height:expr, $block_hash:expr)), * ] => {{
+        #[allow(unused_mut)]
+        bdk_chain::local_chain::LocalChain::from_blocks([$(($height, $block_hash).into()),*])
+    }};
+}
+
 #[allow(unused_macros)]
 macro_rules! chain {
     ($([$($tt:tt)*]),*) => { chain!( checkpoints: [$([$($tt)*]),*] ) };