feat: extra headers parameter in client options (#2091)

Closes #1106

Unfortunately, these need to be set at the connection level. I
investigated whether if we let users provide a callback they could use
`AsyncLocalStorage` to access their context. However, it doesn't seem
like NAPI supports this right now. I filed an issue:
https://github.com/napi-rs/napi-rs/issues/2456

nodejs/__test__/remote.test.ts

@@ -104,4 +104,26 @@ describe("remote connection", () => {
       },
     );
   });
+
+  it("should pass on requested extra headers", async () => {
+    await withMockDatabase(
+      (req, res) => {
+        expect(req.headers["x-my-header"]).toEqual("my-value");
+
+        const body = JSON.stringify({ tables: [] });
+        res.writeHead(200, { "Content-Type": "application/json" }).end(body);
+      },
+      async (db) => {
+        const tableNames = await db.tableNames();
+        expect(tableNames).toEqual([]);
+      },
+      {
+        clientConfig: {
+          extraHeaders: {
+            "x-my-header": "my-value",
+          },
+        },
+      },
+    );
+  });
 });

nodejs/src/remote.rs

@@ -1,6 +1,8 @@
 // SPDX-License-Identifier: Apache-2.0
 // SPDX-FileCopyrightText: Copyright The LanceDB Authors
 
+use std::collections::HashMap;
+
 use napi_derive::*;
 
 /// Timeout configuration for remote HTTP client.
@@ -67,6 +69,7 @@ pub struct ClientConfig {
     pub user_agent: Option<String>,
     pub retry_config: Option<RetryConfig>,
     pub timeout_config: Option<TimeoutConfig>,
+    pub extra_headers: Option<HashMap<String, String>>,
 }
 
 impl From<TimeoutConfig> for lancedb::remote::TimeoutConfig {
@@ -104,6 +107,7 @@ impl From<ClientConfig> for lancedb::remote::ClientConfig {
                 .unwrap_or(concat!("LanceDB-Node-Client/", env!("CARGO_PKG_VERSION")).to_string()),
             retry_config: config.retry_config.map(Into::into).unwrap_or_default(),
             timeout_config: config.timeout_config.map(Into::into).unwrap_or_default(),
+            extra_headers: config.extra_headers.unwrap_or_default(),
         }
     }
 }