feat: add slog logging (#432)

* feat(op): user slog for logging

integrate with golang.org/x/exp/slog for logging.
provide a middleware for request scoped logging.

BREAKING CHANGES:

1. OpenIDProvider and sub-interfaces get a Logger()
method to return the configured logger;
2. AuthRequestError now takes the complete Authorizer,
instead of only the encoder. So that it may use its Logger() method.
3. RequestError now takes a Logger as argument.

* use zitadel/logging

* finish op and testing
without middleware for now

* minimum go version 1.19

* update go mod

* log value testing only on go 1.20 or later

* finish the RP and example

* ping logging release

pkg/oidc/authorization_test.go

@@ -0,0 +1,27 @@
+//go:build go1.20
+
+package oidc
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"golang.org/x/exp/slog"
+)
+
+func TestAuthRequest_LogValue(t *testing.T) {
+	a := &AuthRequest{
+		Scopes:       SpaceDelimitedArray{"a", "b"},
+		ResponseType: "respType",
+		ClientID:     "123",
+		RedirectURI:  "http://example.com/callback",
+	}
+	want := slog.GroupValue(
+		slog.Any("scopes", SpaceDelimitedArray{"a", "b"}),
+		slog.String("response_type", "respType"),
+		slog.String("client_id", "123"),
+		slog.String("redirect_uri", "http://example.com/callback"),
+	)
+	got := a.LogValue()
+	assert.Equal(t, want, got)
+}