deps: do not re-declare grpc dependencies as test dependencies (#278)

* deps: include grpc dependencies

* deps: remove all unnecessary deps

* fix: re-add undeclared dependencies

pom.xml

@@ -147,31 +147,16 @@
     </dependency>
     <dependency>
       <groupId>com.google.api.grpc</groupId>
-      <artifactId>grpc-google-cloud-spanner-v1</artifactId>
+      <artifactId>proto-google-cloud-spanner-v1</artifactId>
     </dependency>
-
+    
     <!-- Test dependencies -->
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-spanner</artifactId>
       <type>test-jar</type>
       <scope>test</scope>
     </dependency>
-    <dependency>
-      <groupId>com.google.api.grpc</groupId>
-      <artifactId>grpc-google-cloud-spanner-v1</artifactId>
-      <scope>test</scope>
-    </dependency>
-    <dependency>
-      <groupId>com.google.api.grpc</groupId>
-      <artifactId>grpc-google-cloud-spanner-admin-instance-v1</artifactId>
-      <scope>test</scope>
-    </dependency>
-    <dependency>
-      <groupId>com.google.api.grpc</groupId>
-      <artifactId>grpc-google-cloud-spanner-admin-database-v1</artifactId>
-      <scope>test</scope>
-    </dependency>
     <dependency>
       <groupId>com.google.truth</groupId>
       <artifactId>truth</artifactId>