schemas: add offer_id to invoice_creation notification

Also partially reverts f960996 which was not properly rebased

Changelog-None

Author: daywalker90

.msggen.json

@@ -2303,6 +2303,7 @@
         "InvoiceCreationNotification": {
             "invoice_creation.label": 3,
             "invoice_creation.msat": 1,
+            "invoice_creation.offer_id": 4,
             "invoice_creation.preimage": 2
         },
         "InvoicePaymentNotification": {
@@ -15687,6 +15688,10 @@
             "added": "pre-v0.10.1",
             "deprecated": null
         },
+        "invoice_creation.offer_id": {
+            "added": "v26.06",
+            "deprecated": null
+        },
         "invoice_creation.preimage": {
             "added": "pre-v0.10.1",
             "deprecated": null

cln-grpc/proto/node.proto

@@ -562,6 +562,8 @@ pub struct ForwardEventNotification {
 pub struct InvoiceCreationNotification {
     #[serde(skip_serializing_if = "Option::is_none")]
     pub msat: Option<Amount>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub offer_id: Option<Sha256>,
     pub label: String,
     pub preimage: Secret,
 }

cln-grpc/src/convert.rs

@@ -40053,6 +40053,13 @@
             "description": [
               "The label of the created invoice."
             ]
+          },
+          "offer_id": {
+            "type": "hash",
+            "added": "v26.06",
+            "description": [
+              "If the invoice is associated with a BOLT 12 offer, this `offer_id` will be present (merkle hash of non-signature fields)."
+            ]
           }
         }
       }