Add standardised SQL connection setup for microservices.

examples/py_simple.py

@@ -1,11 +1,13 @@
 from slingshot_microservice.typing import ReadFileFn, WriteFileFn
 from slingshot_microservice import Microservice
 from typing import Generator
+from sqlalchemy.engine.base import Connection
 
 def process(
 	request: int,
 	read_file: ReadFileFn,
 	write_file: WriteFileFn,
+	_connection: Connection,
 ) -> Generator[tuple[int, bool | int | str], None, None]:
 	reader = read_file("in", request)
 	input_data = reader.read().decode()

examples/simple.rs

@@ -1,10 +1,12 @@
 use slingshot_microservice::{AnyError, Microservice, ReadFileFn, WriteFileFn};
+use diesel::pg::PgConnection;
 use std::io::{Read, Write};
 
 fn process(
 	request: u64,
 	read_file: &ReadFileFn,
 	write_file: &WriteFileFn,
+	_connection: &mut PgConnection,
 ) -> Result<Vec<(u64, String)>, AnyError> {
 	let mut input = String::new();
 	let mut reader = read_file("in", request)?;