test: add concurrent fetch and read tests for privileges

Adds multiple tests to verify the thread-safety of the 
Fetch method and the handling of privileges in concurrent 
operations. Tests include concurrent fetching, reading 
privileges, and processing with multiple goroutines. 
Ensures no errors occur during operations and verifies 
privileges are set correctly.

.gitignore

@@ -1,2 +1,3 @@
 .idea
 /release
+coverage.txt