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/implementation/encrypter/cmd/plugin.go

@@ -0,0 +1,18 @@
+package main
+
+import (
+	"context"
+
+	"github.com/beckn/beckn-onix/pkg/plugin/definition"
+	"github.com/beckn/beckn-onix/pkg/plugin/implementation/encrypter"
+)
+
+// EncrypterProvider implements the definition.EncrypterProvider interface.
+type EncrypterProvider struct{}
+
+func (ep EncrypterProvider) New(ctx context.Context, config map[string]string) (definition.Encrypter, func() error, error) {
+	return encrypter.New(ctx)
+}
+
+// Provider is the exported symbol that the plugin manager will look for.
+var Provider definition.EncrypterProvider = EncrypterProvider{}