fix: Convert vendor/pezkuwi-subxt from submodule to regular directory

vendor/pezkuwi-subxt/historic/CHANGELOG.md

@@ -0,0 +1,37 @@
+# subxt-historic changelog
+
+This is separate from the Subxt changelog as subxt-historic is currently releasaed separately.
+
+Eventually this project will merge with Subxt and no longer exist, but until then it's being maintained and updated where needed.
+
+## 0.0.8 (2025-12-04)
+
+Expose `ClientAtBlock::resolver()`. This hands back a type resolver which is capable of resolving type IDs given by the `.visit()` methods on extrinsic fields and storage values. The extrinsics example has been modified to show how this can be used.
+
+## 0.0.7 (2025-12-03)
+
+Expose `OfflineClientAtBlock`, `OfflineClientAtBlockT`, `OnlinelientAtBlock`, `OnlineClientAtBlockT`.
+
+This is so that you can pass the `ClientAtBlock` into functions like so:
+
+```rust
+use subxt_historic::config::Config;
+use subxt_historic::client::{ ClientAtBlock, OnlineClientAtBlock, OnlineClientAtBlockT };
+
+fn accepts_client_at_block_concrete<T: Config>(client: &ClientAtBlock<OnlineClientAtBlock<'_, T>, T>) {
+    // ...
+}
+fn accepts_client_at_block_generic<'conf, T: Config + 'conf, C: OnlineClientAtBlockT<'conf, T>>(client: &ClientAtBlock<C, T>) {
+    // ...
+}
+```
+
+## 0.0.6 (2025-12-01)
+
+- Add `.metadata()` on `ClientAtBlock` to expose the current metadata at some block.
+
+## 0.0.5 (2025-11-21)
+
+- Rename some fields for consistency.
+- Update versions of underlying libraries being used.
+- Add `.visit()` methods to extrinsic fields and storage values, and examples of using this to our examples.