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

pkg/plugin/definition/encrypter.go

@@ -0,0 +1,15 @@
+package definition
+
+import "context"
+
+// Encrypter defines the methods for encryption.
+type Encrypter interface {
+	// Encrypt encrypts the given body using the provided privateKeyBase64 and publicKeyBase64.
+	Encrypt(ctx context.Context, data string, privateKeyBase64, publicKeyBase64 string) (string, error)
+}
+
+// EncrypterProvider initializes a new encrypter instance with the given config.
+type EncrypterProvider interface {
+	// New creates a new encrypter instance based on the provided config.
+	New(ctx context.Context, config map[string]string) (Encrypter, func() error, error)
+}