feat: unifood base with GET dishes (#1)

Features:
- CLI structure with verbs and resources
- Application config and parameters
- Output formatters
- Initial resource: dishes

Reviewed-on: #1
Co-authored-by: bdoerfchen <git@bissendorf.co>
Co-committed-by: bdoerfchen <git@bissendorf.co>

core/services/jlog/context.go

@@ -0,0 +1,23 @@
+package jlog
+
+import (
+	"context"
+	"log/slog"
+)
+
+type ctxKey string
+
+const ctxkeyLogger ctxKey = "jlog:logger"
+
+func FromContext(ctx context.Context) *slog.Logger {
+	logger, exists := ctx.Value(ctxkeyLogger).(*slog.Logger)
+	if !exists {
+		return New(slog.LevelInfo)
+	}
+
+	return logger
+}
+
+func ContextWith(ctx context.Context, logger *slog.Logger) context.Context {
+	return context.WithValue(ctx, ctxkeyLogger, logger)
+}

core/services/jlog/logger.go

@@ -0,0 +1,24 @@
+package jlog
+
+import (
+	"io"
+	"log/slog"
+	"math/rand"
+	"os"
+	"strconv"
+)
+
+func New(level slog.Level) *slog.Logger {
+	return NewFor(level, os.Stderr)
+}
+
+func NewFor(level slog.Level, output io.Writer) *slog.Logger {
+	return slog.New(slog.NewJSONHandler(output, &slog.HandlerOptions{
+		// AddSource: true,
+		Level: level,
+	})).With(slog.String("traceid", newTraceID()))
+}
+
+func newTraceID() string {
+	return strconv.Itoa(rand.Intn(1000000))
+}