fix: add missing pyo3 feature extension-module and remove Cargo.lock from template due to incongruencies between generated from template vs cargo

Author: 56kyle

{{cookiecutter.project_name}}/rust/Cargo.lock

@@ -9,4 +9,4 @@ name = "{{cookiecutter.package_name}}"
 crate-type = ["cdylib"]
 
 [dependencies]
-pyo3 = "0.22.0"
+pyo3 = { version = "0.22.0", features = ["extension-module"] }