fix: allow newAdapter() function to accept a PrismaClient as well (#42)

Author: ashokgelal

src/adapter.ts

@@ -144,7 +144,7 @@ export class PrismaAdapter implements Adapter {
   }
 
   static async newAdapter(
-    option?: Prisma.PrismaClientOptions
+    option?: Prisma.PrismaClientOptions | PrismaClient
   ): Promise<PrismaAdapter> {
     const a = new PrismaAdapter(option);
     await a.#open();