refactor: move transforms/ into infrahub/ and update all paths (#20)

Move transforms/{queries,templates,tests} under infrahub/transforms/ so all
Infrahub-managed content lives under the dedicated infrahub/ directory,
consistent with schemas/, objects/, and menus/.

Updated paths:
- .infrahub.yml: file_path and template_path entries now prefixed with
  infrahub/transforms/
- infrahub/transforms/tests/*/test.yml: directory references updated from
  transforms/tests/* to infrahub/transforms/tests/*

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

infrahub/transforms/tests/vlan_yang/output.json

@@ -0,0 +1,32 @@
+[
+  {
+    "name": "test-l2-vxlan",
+    "status": "ACTIVE",
+    "stp_enabled": true,
+    "trunk_groups": null,
+    "vlan_id": 40,
+    "vlan_type": "standard",
+    "vni": 110040,
+    "vni_type": "l2vni"
+  },
+  {
+    "name": "mlag-peer",
+    "status": "ACTIVE",
+    "stp_enabled": false,
+    "trunk_groups": ["mlag-peer"],
+    "vlan_id": 4090,
+    "vlan_type": "mlag_peer",
+    "vni": null,
+    "vni_type": null
+  },
+  {
+    "name": "mlag-ibgp",
+    "status": "ACTIVE",
+    "stp_enabled": false,
+    "trunk_groups": ["mlag-peer"],
+    "vlan_id": 4091,
+    "vlan_type": "mlag_ibgp",
+    "vni": null,
+    "vni_type": null
+  }
+]