public ShenYuBeforeEachSpec build() {
            return new ShenYuBeforeEachSpec(checker, builder.build(), waiting);
        }
builder build before each spec.
@return ShenYuBeforeEachSpec
shenyu-e2e/shenyu-e2e-engine/src/main/java/org/apache/shenyu/e2e/engine/scenario/specification/ShenYuBeforeEachSpec.java