feat(merger): 定义中立的特征表达数据、定义工厂方法根据特征数据来获取具体的merger #591

	# Copyright 2021 ecodeclub
	#
	# Licensed under the Apache License, Version 2.0 (the "License");
	# you may not use this file except in compliance with the License.
	# You may obtain a copy of the License at
	#
	# http://www.apache.org/licenses/LICENSE-2.0
	#
	# Unless required by applicable law or agreed to in writing, software
	# distributed under the License is distributed on an "AS IS" BASIS,
	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	# See the License for the specific language governing permissions and
	# limitations under the License.

	name: Check License Lines
	on:
	pull_request:
	types: [opened, synchronize, reopened, labeled, unlabeled]
	branches:
	- dev
	- main
	jobs:
	check-license-lines:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@master
	- name: Check License Lines
	uses: kt3k/license_checker@v1.0.6

Provide feedback