Initial rebrand from paritytech/subxt to pezkuwichain/pezkuwi-subxt

- Renamed all subxt crates to pezkuwi-subxt
- Updated internal references
- Configured for Pezkuwi ecosystem

examples/ffi-example/.gitignore

@@ -0,0 +1,10 @@
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb
+db.sqlite
+db.sqlite-shm
+db.sqlite-wal
+.tool-versions
+
+/target
+/build
+/node_modules