Update examples (#13)

Motivation:

The examples use the '.ipv4(host:)' target to resolve. We renamed this
to '.ipv4(address:)' which is more accurate. However, the examples
should most likely use '.dns(host:)' with "localhost" rather than the
IPv4 address automatically as '.dns(host:)' is more likely to be used in
real world applications.

Modifications:

- Change example clients from using '.ipv4(host: "127.0.0.1")' to
  '.dns(host: "localhost)'.

Result:

Fewer warnings, better examples

Author: glbrntt

Examples/echo-metadata/Sources/ClientArguments.swift

@@ -30,6 +30,6 @@ struct ClientArguments: ParsableArguments {
 
 extension ClientArguments {
   var target: any ResolvableTarget {
-    return .ipv4(host: "127.0.0.1", port: self.port)
+    return .dns(host: "localhost", port: self.port)
   }
 }

Examples/echo/Sources/Subcommands/ClientArguments.swift

@@ -30,6 +30,6 @@ struct ClientArguments: ParsableArguments {
 
 extension ClientArguments {
   var target: any ResolvableTarget {
-    return .ipv4(host: "127.0.0.1", port: self.port)
+    return .dns(host: "localhost", port: self.port)
   }
 }

Examples/hello-world/Sources/Subcommands/Greet.swift

@@ -31,7 +31,7 @@ struct Greet: AsyncParsableCommand {
   func run() async throws {
     try await withGRPCClient(
       transport: .http2NIOPosix(
-        target: .ipv4(host: "127.0.0.1", port: self.port),
+        target: .dns(host: "localhost", port: self.port),
         transportSecurity: .plaintext
       )
     ) { client in

Examples/route-guide/Sources/Subcommands/GetFeature.swift

@@ -39,7 +39,7 @@ struct GetFeature: AsyncParsableCommand {
   func run() async throws {
     try await withGRPCClient(
       transport: .http2NIOPosix(
-        target: .ipv4(host: "127.0.0.1", port: self.port),
+        target: .dns(host: "localhost", port: self.port),
         transportSecurity: .plaintext
       )
     ) { client in

Examples/route-guide/Sources/Subcommands/ListFeatures.swift

@@ -53,7 +53,7 @@ struct ListFeatures: AsyncParsableCommand {
   func run() async throws {
     try await withGRPCClient(
       transport: .http2NIOPosix(
-        target: .ipv4(host: "127.0.0.1", port: self.port),
+        target: .dns(host: "localhost", port: self.port),
         transportSecurity: .plaintext
       )
     ) { client in

Examples/route-guide/Sources/Subcommands/RecordRoute.swift

@@ -32,7 +32,7 @@ struct RecordRoute: AsyncParsableCommand {
   func run() async throws {
     try await withGRPCClient(
       transport: .http2NIOPosix(
-        target: .ipv4(host: "127.0.0.1", port: self.port),
+        target: .dns(host: "localhost", port: self.port),
         transportSecurity: .plaintext
       )
     ) { client in

Examples/route-guide/Sources/Subcommands/RouteChat.swift

@@ -32,7 +32,7 @@ struct RouteChat: AsyncParsableCommand {
   func run() async throws {
     try await withGRPCClient(
       transport: .http2NIOPosix(
-        target: .ipv4(host: "127.0.0.1", port: self.port),
+        target: .dns(host: "localhost", port: self.port),
         transportSecurity: .plaintext
       )
     ) { client in