Bug: 未正确对markdown表格读写

[gavanx]

Lexical version:

Steps To Reproduce

1. 使用convertFromMarkdownString不能正常解析表格的markdown语法
   2.使用convertToMarkdownString未生成markdown的表格语法

例如：

Method	Description
GET	:material-check: Fetch resource
PUT	:material-check-all: Update resource
DELETE	:material-close: Delete resource

Link to code example:

The current behavior

The expected behavior

Impact of fix