feat: encryption plugin (#429)

* feat: Implement encryption plugin.

* fix: Removed interface test file

* fix: Test case changes

* fix: Test case for encryption

* fix: formatting changes

* fix: lint change

* fix: shared renamed to pkg

* fix: shared rename to pkg

* fix: resolved pr comments

* fix: indentation, formatting

* fix: removed config, ctx check, test enhancements

* fix: removed close function

* fix: remove config and enhance test cases

* fix: formatting changes, test case enhancement

go.mod

@@ -7,6 +7,7 @@ toolchain go1.23.7
 require golang.org/x/crypto v0.36.0
 
 require (
+	github.com/zenazn/pkcs7pad v0.0.0-20170308005700-253a5b1f0e03
 	cloud.google.com/go v0.119.0 // indirect
 	cloud.google.com/go/auth v0.15.0 // indirect
 	cloud.google.com/go/auth/oauth2adapt v0.2.7 // indirect