[drivers][serial_v2]允许阻塞接收超过rx缓冲区大小的数据、增加超时时间、flush、获取缓冲区数据长度命令、数据溢出逻… #141

	#
	# Copyright (c) 2006-2024, RT-Thread Development Team
	#
	# SPDX-License-Identifier: Apache-2.0
	#
	# Change Logs:
	# Date Author Notes
	# 2024-08-26 supperthomas the first version
	#

	#这个action用来自动给pull request 添加标签
	#当一个pull request被打开时，这个action会自动给这个pull request添加标签

	name: "Pull Request Labeler"
	on:
	- pull_request_target

	jobs:
	labeler:
	permissions:
	contents: read
	pull-requests: write
	runs-on: ubuntu-latest
	steps:
	- uses: actions/labeler@v5

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