Add offical logos for Python and R

[ajbozarth]

Currently we use the jupyterlab python logo, but with the addition
of R support we would like to have pipelines use the the offical
logos for each node instead of ones designed for the lab file browser

Fixes #1445

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[ajbozarth]

Leaving this WIP for a few reasons

1. need to test/update it once Enable support for adding R Script to Pipeline #1418 is merged
2. I'm not sure yet on if I've changed the logo everywhere it should be changed

Places to change the python logo and whether I've changed them:

• In the file browser. I have NOT changed this, but am unsure if we should
• In the launcher. I have changed this, but am unsure if we should
• In the tab bar for python editor. I have NOT changed this, but it should match the file browser no matter our choice.
• In pipelines. I changed this and it should use the new icon.

[bourdakos1]

I think we should leave the file browser and tab bar as is and have the pipeline nodes match that.

For the launcher icons, I think we should do our best to match the other present launcher icons. I updated the "official" svg to match the other pngs more closely: https://codesandbox.io/s/python-logo-z05p4?file=/src/App.tsx

I personally think the icon in this PR is awkwardly too close to the other launcher icons, but not close enough so it draws your eye in a bad way. If we don't use something closer to the pngs, then I think we should go back to using the icon from file browser

[ajbozarth]

I've pushed a few updates:

• Updated the R icon in pipelines
• Updated to use Python icons in all four use cases listed in my previous comment.
  • The code for changing the icon in the file browser won't work until DocRegistry FileType pattern matching doesn't work jupyterlab/jupyterlab#9958 is merged

Some screenshots of the current state:

[ajbozarth]

The upstream PR has been merged and I've pushed an update here to support both python and r icon in the side bar, new screenshots:

[lresende]

The related lab PR jupyterlab/jupyterlab#9958 is now available on JupyterLab 3.0.12. Also, on existing pipelines, as the node icon is part of the pipeline, you would need to re-add the node to the pipeline.

[ajbozarth]

Also, on existing pipelines, as the node icon is part of the pipeline, you would need to re-add the node to the pipeline.

It may be worth including updating the icon as a pipeline version update

[lresende]

LGTM: