Add bridge backend for sync

Signed-off-by: Bryan Frimin <bryan@getprobo.com>

pkg/iam/scim/bridge/provider/provider.go

@@ -0,0 +1,28 @@
+// Copyright (c) 2025 Probo Inc <hello@getprobo.com>.
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+// Package provider defines the interface for identity providers that can be
+// used as a source of truth for SCIM synchronization.
+package provider
+
+import (
+	"context"
+
+	scimclient "go.probo.inc/probo/pkg/iam/scim/bridge/client"
+)
+
+type Provider interface {
+	Name() string
+	ListUsers(ctx context.Context) (scimclient.Users, error)
+}