feat: Allow passing HTTP headers to client fetcher

Add the ability to pass extra HTTP headers to a request. To achieve this
the third argument (signal) now can also be a RequestOptions object
(recommended), which includes the signal and headers keys.

.changeset/modern-walls-sip.md

@@ -0,0 +1,5 @@
+---
+"@labdigital/graphql-fetcher": minor
+---
+
+Support passing extra HTTP headers to client fetcher

README.md

@@ -12,6 +12,24 @@ Only used for fetching from GraphQL endpoints.
 - Client fetcher with React context support when the endpoint is only known at runtime
 - Next data cache support
 
+
+## Usage
+
+```ts
+import { initClientFetcher } from "@labdigital/graphql-fetcher";
+
+const fetcher = initClientFetcher("https://localhost/graphql");
+
+const gqlResponse = await fetcher(query, {
+	myVar: "baz",
+}, {
+	signal: AbortSignal.timeout(10),
+	headers: {
+		"X-extra-header": "foo",
+	}
+});
+```
+
 ## Notes
 
 ### Node 18.x requires webcrypto on globalThis

package.json

@@ -67,5 +67,6 @@
 		"react": ">= 18.0.0",
 		"react-dom": ">= 18.2.0",
 		"@opentelemetry/api": ">= 1.7.0"
-	}
+	},
+	"packageManager": "[email protected]"
 }