Add oci managed terraform + create snet module

oci-managed/provider.tf

@@ -0,0 +1,17 @@
+terraform {
+  required_providers {
+    oci = {
+      source  = "oracle/oci"
+      version = ">= 5.30.0"
+    }
+  }
+}
+
+provider "oci" {
+  tenancy_ocid         = var.tenancy_ocid
+  user_ocid            = var.user_ocid
+  private_key_path = pathexpand(var.private_key_path)
+  fingerprint          = var.fingerprint
+  region               = var.region
+  retry_duration_seconds = 120
+}