feat(ops/yandex-cloud-rs): generated gRPC clients for Yandex Cloud

This uses tonic to generate the full set of gRPC clients for Yandex
Cloud. Includes some utility functions like an authentication
interceptor to make these actually work.

Since the upstream protos are exported regularly I've decided that the
versioning will simply be date-based.

The point of this is journaldriver integration, of course, hence also
the log-centric example code.

Change-Id: I00a615dcba80030e7f9bcfd476b2cfdb298f130d
Reviewed-on: https://cl.tvl.fyi/c/depot/+/8525
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>

ops/yandex-cloud-rs/examples/log-write.rs

@@ -0,0 +1,37 @@
+//! This example uses the Yandex Cloud Logging API to write a log entry.
+
+use prost_types::Timestamp;
+use tonic::transport::channel::Endpoint;
+use yandex_cloud::yandex::cloud::logging::v1::destination::Destination;
+use yandex_cloud::yandex::cloud::logging::v1::log_ingestion_service_client::LogIngestionServiceClient;
+use yandex_cloud::yandex::cloud::logging::v1::Destination as OuterDestination;
+use yandex_cloud::yandex::cloud::logging::v1::IncomingLogEntry;
+use yandex_cloud::yandex::cloud::logging::v1::WriteRequest;
+use yandex_cloud::AuthInterceptor;
+
+#[tokio::main(flavor = "current_thread")]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let channel = Endpoint::from_static("https://ingester.logging.yandexcloud.net")
+        .connect()
+        .await?;
+
+    let mut client = LogIngestionServiceClient::with_interceptor(
+        channel,
+        AuthInterceptor::new("YOUR_TOKEN_HERE"),
+    );
+
+    let request = WriteRequest {
+        destination: Some(OuterDestination {
+            destination: Some(Destination::LogGroupId("YOUR_LOG_GROUP_ID".into())),
+        }),
+        entries: vec![IncomingLogEntry {
+            timestamp: Some(Timestamp::date_time(2023, 04, 24, 23, 44, 30).unwrap()),
+            message: "test log message".into(),
+            ..Default::default()
+        }],
+        ..Default::default()
+    };
+
+    client.write(request).await.unwrap();
+    Ok(())
+}