internal/pipewire: implement Core::Hello

This implements enough types to correctly marshal and unmarshal Core::Hello.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/pipewire/core_test.go

@@ -0,0 +1,22 @@
+package pipewire_test
+
+import (
+	"testing"
+
+	"hakurei.app/internal/pipewire"
+)
+
+func TestCoreHello(t *testing.T) {
+	encodingTestCases[pipewire.CoreHello, *pipewire.CoreHello]{
+		{"sample", []byte{
+			0x10, 0, 0, 0,
+			0xe, 0, 0, 0,
+			4, 0, 0, 0,
+			4, 0, 0, 0,
+			4, 0, 0, 0,
+			0, 0, 0, 0,
+		}, pipewire.CoreHello{
+			Version: pipewire.PW_VERSION_CORE,
+		}, nil},
+	}.run(t)
+}