make vertex types optional since they sometimes go missing (#1909)

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> [!IMPORTANT]
> Made several fields optional in `google/types.rs` and
`vertex/types.rs` structs and updated dependencies in `uv.lock`.
> 
>   - **Struct Changes**:
> - In `google/types.rs` and `vertex/types.rs`, made fields in
`Citation`, `Date`, `GroundingMetadata`, and `SearchEntryPoint` structs
optional.
>   - **Dependency Changes**:
> - In `uv.lock`, changed platform marker for `colorama` dependency from
`sys_platform == 'win32'` to `platform_system == 'Windows'`.
>     - Removed `types-assertpy` from dev-dependencies in `uv.lock`.
> 
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Author: aaronvg

engine/baml-runtime/src/internal/llm_client/primitive/google/types.rs

@@ -300,33 +300,33 @@ pub struct CitationMetadata {
 #[derive(Serialize, Deserialize, Debug)]
 #[serde(rename_all = "camelCase")]
 pub struct Citation {
-    pub start_index: i32,
-    pub end_index: i32,
-    pub uri: String,
-    pub title: String,
-    pub license: String,
-    pub publication_date: Date,
+    pub start_index: Option<i32>,
+    pub end_index: Option<i32>,
+    pub uri: Option<String>,
+    pub title: Option<String>,
+    pub license: Option<String>,
+    pub publication_date: Option<Date>,
 }
 
 #[derive(Serialize, Deserialize, Debug)]
 pub struct Date {
-    pub year: i32,
-    pub month: i32,
-    pub day: i32,
+    pub year: Option<i32>,
+    pub month: Option<i32>,
+    pub day: Option<i32>,
 }
 
 #[derive(Serialize, Deserialize, Debug)]
 #[serde(rename_all = "camelCase")]
 pub struct GroundingMetadata {
-    pub web_search_queries: Vec<String>,
-    pub search_entry_point: SearchEntryPoint,
+    pub web_search_queries: Option<Vec<String>>,
+    pub search_entry_point: Option<SearchEntryPoint>,
 }
 
 #[derive(Serialize, Deserialize, Debug)]
 #[serde(rename_all = "camelCase")]
 pub struct SearchEntryPoint {
-    pub rendered_content: String,
-    pub sdk_blob: Vec<u8>,
+    pub rendered_content: Option<String>,
+    pub sdk_blob: Option<Vec<u8>>,
 }
 
 #[derive(Serialize, Deserialize, Debug)]

engine/baml-runtime/src/internal/llm_client/primitive/vertex/types.rs

@@ -321,23 +321,23 @@ pub struct Citation {
 
 #[derive(Serialize, Deserialize, Debug)]
 pub struct Date {
-    pub year: i32,
-    pub month: i32,
-    pub day: i32,
+    pub year: Option<i32>,
+    pub month: Option<i32>,
+    pub day: Option<i32>,
 }
 
 #[derive(Serialize, Deserialize, Debug)]
 #[serde(rename_all = "camelCase")]
 pub struct GroundingMetadata {
-    pub web_search_queries: Vec<String>,
-    pub search_entry_point: SearchEntryPoint,
+    pub web_search_queries: Option<Vec<String>>,
+    pub search_entry_point: Option<SearchEntryPoint>,
 }
 
 #[derive(Serialize, Deserialize, Debug)]
 #[serde(rename_all = "camelCase")]
 pub struct SearchEntryPoint {
-    pub rendered_content: String,
-    pub sdk_blob: Vec<u8>,
+    pub rendered_content: Option<String>,
+    pub sdk_blob: Option<Vec<u8>>,
 }
 
 #[derive(Serialize, Deserialize, Debug, Clone)]