cannot escape character within backtick within a table

[rbalet]

🐛 Bug Report

when using backtick within a table, the pipe | wont be espace by the backslash \
(originally raised here)

To Reproduce

try this code within a docusaurus md file

| Test                            | x        | x   |
| ------------------------------- | -------- | --- |
| `this pipe \| should be espace` | and this | not |

Expected behavior

escaping the | when using \

Actual Behavior

Create a new column

[luoye-fe]

#379