fix(cubesql): Fix cube rust client schema for custom granularities with sql

packages/cubejs-api-gateway/openspec.yml

@@ -105,14 +105,15 @@ components:
       required:
         - name
         - title
-        - interval
       properties:
         name:
           type: "string"
         title:
           type: "string"
         interval:
           type: "string"
+        sql:
+          type: "string"
         offset:
           type: "string"
         origin:

rust/cubesql/cubeclient/src/models/v1_cube_meta_dimension_granularity.rs

@@ -14,20 +14,23 @@ pub struct V1CubeMetaDimensionGranularity {
     pub name: String,
     #[serde(rename = "title")]
     pub title: String,
-    #[serde(rename = "interval")]
-    pub interval: String,
+    #[serde(rename = "interval", skip_serializing_if = "Option::is_none")]
+    pub interval: Option<String>,
+    #[serde(rename = "sql", skip_serializing_if = "Option::is_none")]
+    pub sql: Option<String>,
     #[serde(rename = "offset", skip_serializing_if = "Option::is_none")]
     pub offset: Option<String>,
     #[serde(rename = "origin", skip_serializing_if = "Option::is_none")]
     pub origin: Option<String>,
 }
 
 impl V1CubeMetaDimensionGranularity {
-    pub fn new(name: String, title: String, interval: String) -> V1CubeMetaDimensionGranularity {
+    pub fn new(name: String, title: String) -> V1CubeMetaDimensionGranularity {
         V1CubeMetaDimensionGranularity {
             name,
             title,
-            interval,
+            interval: None,
+            sql: None,
             offset: None,
             origin: None,
         }