refactoring

- enable CREATE EXTENSION and LOAD test
- change test_file_download to use mock_s3

- some code cleanup
- add caching of extensions_list

- WIP downloading of shared_preload_libraries (not tested yet)

compute_tools/src/http/api.rs

@@ -16,8 +16,6 @@ use tokio::task;
 use tracing::{error, info};
 use tracing_utils::http::OtelName;
 
-use crate::extension_server::{download_extension_sql_files, download_library_file};
-
 fn status_response_from_state(state: &ComputeState) -> ComputeStatusResponse {
     ComputeStatusResponse {
         start_time: state.start_time,