refactored all functions (#145)

* refactored stat_object

refactored select_object_content

refactor get_presigned_object_url

refactor get_presigned_policy_form_data

refactored upload-part-copy

* fixed object.unwrap

* update region

* made client Arc

* made client Arc

* update client

* update tests

* update segmented_bytes

* bench updated

* cleanup version handling

* cleanup of headers: multimap

* added inner in Client

* updated clients: added Into<String>in API

* Separated http_client and shared client items in Client

tests/run-tests-windows.ps1

@@ -8,4 +8,7 @@ $Env:IGNORE_CERT_CHECK = "false"
 $Env:SERVER_REGION = ""
 
 # Run tests
-cargo test
+cargo test -- --nocapture
+
+# run one specific test and show stdout
+# cargo test --test test_bucket_exists -- --nocapture