feat: add boolean parser and validator

src/validation/validators/boolean.validator.ts

@@ -0,0 +1,16 @@
+import { TypeValidator } from './interfaces.validator';
+import { PropertyValidationError } from '../PropertyValidationError';
+
+export const boolean = Symbol('boolean');
+type BooleanValidator = TypeValidator<boolean, typeof boolean>;
+
+export const BooleanValidator: BooleanValidator = {
+  type: boolean,
+  validateAndParse: function(value) {
+    if (typeof value === 'boolean') {
+      return value;
+    } else {
+      throw new PropertyValidationError({ value, type: this.type });
+    }
+  }
+};