Add jupyter language multi packs recipe

[fcollonval]

Checklist

• Title of this PR is meaningful: e.g. "Adding my_nifty_package", not "updated meta.yaml".
• License file is packaged (see here for an example).
• Source is from official source.
• Package does not vendor other packages. (If a package uses the source of another package, they should be separate packages or the licenses of all packages need to be packaged).
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This is based on #15771 (comment)

Closes #15771
Closes #15776
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[conda-forge-linter]

Hi! This is the friendly automated conda-forge-linting service.

I wanted to let you know that I linted all conda-recipes in your PR (recipes/juypterlab-language-packs) and found some lint.

Here's what I've got...

For recipes/juypterlab-language-packs:

• The recipe must have some tests.

[conda-forge-linter]

Hi! This is the friendly automated conda-forge-linting service.

I wanted to let you know that I linted all conda-recipes in your PR (recipes/juypterlab-language-packs) and found some lint.

Here's what I've got...

For recipes/juypterlab-language-packs:

• The top level meta keys are in an unexpected order. Expecting ['package', 'source', 'build', 'requirements', 'test', 'outputs', 'about', 'extra'].

[conda-forge-linter]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipes/juypterlab-language-packs) and found it was in an excellent condition.

[fcollonval]

Link to pipeline: https://dev.azure.com/conda-forge/feedstock-builds/_build?definitionId=2259&_a=summary&branchFilter=154137

[fcollonval]

This change the conda packaging of JupyterLab language packs in a mono-recipe.

@blink1073 @goanpeca @krassowski do you agree to become maintainers of this recipe?

[fcollonval]

Pipeline on the latest commit are passing: https://dev.azure.com/conda-forge/feedstock-builds/_build/results?buildId=366383&view=logs&j=6f142865-96c3-535c-b7ea-873d86b887bd

[blink1073]

👍🏼

[krassowski]

I agree.

[blink1073]

Thanks @fcollonval and @xhochy!