🔨 Move cli folder contents into project root (#1253)

* Remove `logger` module

* Remove `shared` module

* Move `cli` folder contents into project root

* Fix linter

* Change the module name from `github.com/kubeshark/kubeshark/cli` to `github.com/kubeshark/kubeshark`

* Set the default `Makefile` rule to `build`

* Add `lint` rule

* Fix the linter errors

errormessage/errormessage.go

@@ -0,0 +1,37 @@
+package errormessage
+
+import (
+	"errors"
+	"fmt"
+	regexpsyntax "regexp/syntax"
+
+	"github.com/kubeshark/kubeshark/config"
+
+	k8serrors "k8s.io/apimachinery/pkg/api/errors"
+)
+
+// formatError wraps error with a detailed message that is meant for the user.
+// While the errors are meant to be displayed, they are not meant to be exported as classes outsite of CLI.
+func FormatError(err error) error {
+	var errorNew error
+	if k8serrors.IsForbidden(err) {
+		errorNew = fmt.Errorf("insufficient permissions: %w. "+
+			"supply the required permission or control Kubeshark's access to namespaces by setting %s "+
+			"in the config file or setting the tapped namespace with --%s %s=<NAMEPSACE>",
+			err,
+			config.KubesharkResourcesNamespaceConfigName,
+			config.SetCommandName,
+			config.KubesharkResourcesNamespaceConfigName)
+	} else if syntaxError, isSyntaxError := asRegexSyntaxError(err); isSyntaxError {
+		errorNew = fmt.Errorf("regex %s is invalid: %w", syntaxError.Expr, err)
+	} else {
+		errorNew = err
+	}
+
+	return errorNew
+}
+
+func asRegexSyntaxError(err error) (*regexpsyntax.Error, bool) {
+	var syntaxError *regexpsyntax.Error
+	return syntaxError, errors.As(err, &syntaxError)
+}