Absorb jupytext .py notebooks feature as officially developed & distributed

[goyalyashpal]

Titles/Summaries:

• Absorb jupytext as officially developed & distributed
• Merge jupytext and make it official & hence also included by default

Problem

Described in jupyterlab/jupyterlab#14386

Proposed Solution

Merge the jupytext (MIT licenced) 's ability to load plain source files (like .py) as notebooks within existing notebook used by jupyterlab so that it's functionality comes built in with jupyterlab.

The scope of jupytext thereafter can stay focused on the syncing ability between source and notebook files.

Additional context

Jupytext provides ability to open .py source files as notebooks.

Ever since @ krassowski shared it with me at jupyterlab/jupyterlab#14386 (comment) , I am:

• doing development in jupytext notebooks, and
• doing any refactorings (like changing variable name, moving lines up/down etc) in VSCodium
• and honestly, it is awesome.

The only thing stopping this is lack of ability to auto reload files from disk
(the collaborative mode of jupyterlab v4.0.0rc1 doesn't support jupytext notebooks).

Due to this (and lack of a direct keyboard shortcut), I often forget manually reloading the jupytext notebook, and end up losing the changes.

I know that this auto-reload is just one small feature, and will come eventually for jupytext too; but absorbing jupytext as official will ensure such things don't happen sort of loose hangingly in future.

I use TeXStudio (called TXS in short) in a similar way with VSCodium; and TXS shows this dialog when it detects changes in file on disk.

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