Script and documentation for regenerating sqlite test files (#14290)

* Adding script and documentation for regenerating sqlite test files.

* Prettier.

* Script updates, include customized sqllogictests.rs file for regeneration.

* Minor comment update

* Removed use of sed, fixed using host.docker.internal when starting up pg via docker, cleanup pg_compat .bak files.

Author: Omega359

datafusion/sqllogictest/README.md

@@ -250,6 +250,13 @@ database engine. The output is a full script that is a copy of the prototype scr
 
 You can update the tests / generate expected output by passing the `--complete` argument.
 
+To regenerate and complete the sqlite test suite's files in datafusion-testing/data/sqlite/ please refer to the
+'./regenerate_sqlite_files.sh' file.
+
+_WARNING_: The regenerate_sqlite_files.sh is experimental and should be understood and run with an abundance of caution.
+When run the script will clone a remote repository locally, replace the location of a dependency with a custom git
+version, will replace an existing .rs file with one from a github gist and will run various commands locally.
+
 ```shell
 # Update ddl.slt with output from running
 cargo test --test sqllogictests -- ddl --complete

datafusion/sqllogictest/bin/postgres_container.rs

@@ -123,8 +123,8 @@ async fn start_postgres(
         .await
         .unwrap();
     // uncomment this if you are running docker in docker
-    let host = "host.docker.internal".to_string();
-    // let host = container.get_host().await.unwrap().to_string();
+    // let host = "host.docker.internal".to_string();
+    let host = container.get_host().await.unwrap().to_string();
     let port = container.get_host_port_ipv4(5432).await.unwrap();
 
     let mut rx = in_channel.rx.lock().await;