add Block + Component, add TextComponent with min, max and regex validators and early NumberComponent

internal/block/validation/required.go

@@ -0,0 +1,14 @@
+package validation
+
+import "fmt"
+
+func Required() ComponentOption {
+	return func(c *ComponentConfig) {
+		c.Validators = append(c.Validators, func(value any) error {
+			if value == nil || value == "" {
+				return fmt.Errorf("field is required")
+			}
+			return nil
+		})
+	}
+}