in markdown renderer: make priority of code or math quotation to be grater than of table separator

[FeelUsM]

steps to reproduce:

insert next text

| `\bigg|_1^2` | $\bigg|_1^2$ |
| ------ | ----- |
|        |       |

expected behavior:

rendered table with fields \bigg|_1^2 and $\bigg|_1^2$

actual behavior:

It continues to be displayed as inserted text
| \bigg|_1^2 | $\bigg|_1^2$ |
| ------ | ----- |
| | |

If I insert next text:

| `\bigg|_1^2` |
| ------ | ----- |
|        |       |

I get:

`\bigg	_1^2`

[RRosio]

Thank you for opening this issue @FeelUsM, @krassowski was able to reproduce this in JupyterLab as well. It would be good to report this upstream as the logic for this rendering is in the JupyterLab repository.