feat: decryption plugin (#430)

* feat: Implemented decryption plugin

* fix: Removed interface test file

* fix: Test case

* fix: Test case for plugin

* fix: test case change

* fix: resolved pr comments

* fix: resolved pr comments

* fix: removed mock dcrypter

* fix: formatting

* fix: removed config, close function, enhanced test cases

* fix: test cases enhancement, formatting

pkg/plugin/implementation/decrypter/cmd/plugin.go

@@ -0,0 +1,19 @@
+package main
+
+import (
+	"context"
+
+	"github.com/beckn/beckn-onix/pkg/plugin/definition"
+	decrypter "github.com/beckn/beckn-onix/pkg/plugin/implementation/decrypter"
+)
+
+// DecrypterProvider implements the definition.DecrypterProvider interface.
+type DecrypterProvider struct{}
+
+// New creates a new Decrypter instance using the provided configuration.
+func (dp DecrypterProvider) New(ctx context.Context, config map[string]string) (definition.Decrypter, func() error, error) {
+	return decrypter.New(ctx)
+}
+
+// Provider is the exported symbol that the plugin manager will look for.
+var Provider definition.DecrypterProvider = DecrypterProvider{}