refactor: organize plugin to support multiple services (#1)

Co-authored-by: Michael Li <michael.li@hashicorp.com>

plugin/service/host/state_test.go

@@ -0,0 +1,32 @@
+package host
+
+import (
+	"testing"
+
+	"github.com/hashicorp/boundary-plugin-host-aws/internal/credential"
+	"github.com/stretchr/testify/require"
+)
+
+func TestAwsCatalogPersistedStateEC2Client(t *testing.T) {
+	require := require.New(t)
+	cred, err := credential.NewAwsCredentialPersistedState(
+		credential.WithRegion("us-west-2"),
+		credential.WithAccessKeyId("foobar"),
+		credential.WithSecretAccessKey("barfoo"),
+	)
+	require.NoError(err)
+
+	state, err := newAwsCatalogPersistedState(
+		withCredentials(cred),
+		withTestEC2APIFunc(newTestMockEC2(nil)),
+	)
+	require.NoError(err)
+
+	clientRaw, err := state.EC2Client("us-west-2")
+	require.NoError(err)
+	require.NotNil(clientRaw)
+	client, ok := clientRaw.(*testMockEC2)
+	require.True(ok)
+	require.NotNil(client)
+	require.Equal("us-west-2", client.Region)
+}