[WIP] Add meca content provider

[stevejpurves]

This PR adds a content provider for MECA Bundles.

MECA stands for Manuscript Exchange Common Approach, a NISO standard for transfer of manuscripts between manuscript systems.

The provider was written during in 2023 as part of the AGU's NotebooksNow project. The aim of that project is to make notebook based computational research papers a formal part of the scientific record, and has drawn on inputs from a number of working groups and stakeholder organisations.

MECA was identified as a way to consistently package files from a git repository, paired with JATS xml, that would enable a set of notebooks, code, REES environment specification, into an single file that could be accepted and archived in existing publishing systems.

Support to produce MECA files has been included in Myst Markdown and Quatro author toolchains, enabling researchers to export to this format and the first AGU journal supporting the format is going live in 2024.

By adding provider as a standard provider in repo2docker/binderhub, we'll enable authors and researchers to reproduce research articles that include this bundle.

This provider is intended to be paired with the BinderHub Repo Provider being added in this PR: jupyterhub/binderhub#1824

Operation

The provider receives a parsed url to a Meca bundle, which is a zip file. The zipfile is fetched to a local tmp folder and unpacked. Given a manifest.xml with expected tags to a article-source-directory, that identifies the path to use for docker creation. (we expect a REES compatible environment to be present. If this information is missing, we try to build from the root folder.

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[sgaist]

The implementation functionally wise looks fine.

There are some minor suggestions.

I would also recommend to run pre-commit, it will cleanup the imports as well as some whites pace related things.

[stevejpurves]

thanks @sgaist
I'm continuing to test locally this week and hope to pop this PR out of "draft" be the week end. I'm hitting some edge cases that I'm looking into:

• url specs contain multiple query params, these can be stripped after the first parameter
• the provider works when used in conjunction with binderhub but errors out when used from the command line