feat: http provider signing key addition (#10641)

# Which Problems Are Solved

HTTP Request to HTTP providers for Email or SMS are not signed.

# How the Problems Are Solved

Add a Signing Key to the HTTP Provider resources, which is then used to
generate a header to sign the payload.

# Additional Changes

Additional tests for query side of the SMTP provider.

# Additional Context

Closes #10067

---------

Co-authored-by: Marco A. <marco@zitadel.com>
(cherry picked from commit 8909b9a2a6)

internal/api/grpc/object/converter_test.go

@@ -0,0 +1,63 @@
+package object
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	object_pb "github.com/zitadel/zitadel/pkg/grpc/object"
+)
+
+func Test_ListQueryToModel(t *testing.T) {
+	type args struct {
+		req *object_pb.ListQuery
+	}
+	type res struct {
+		offset, limit uint64
+		asc           bool
+	}
+	tests := []struct {
+		name string
+		args args
+		res  res
+	}{
+		{
+			name: "all fields filled",
+			args: args{
+				req: &object_pb.ListQuery{
+					Offset: 100,
+					Limit:  100,
+					Asc:    true,
+				},
+			},
+			res: res{
+				offset: 100,
+				limit:  100,
+				asc:    true,
+			},
+		},
+		{
+			name: "all fields empty",
+			args: args{
+				req: &object_pb.ListQuery{
+					Offset: 0,
+					Limit:  0,
+					Asc:    false,
+				},
+			},
+			res: res{
+				offset: 0,
+				limit:  0,
+				asc:    false,
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			offset, limit, asc := ListQueryToModel(tt.args.req)
+			assert.Equal(t, tt.res.offset, offset)
+			assert.Equal(t, tt.res.limit, limit)
+			assert.Equal(t, tt.res.asc, asc)
+		})
+	}
+}