Initial version of metadata and build plugins

[benoit74]

Rationale

For openzim/_python-bootstrap#35:

• Implement a metadata plugin which will populates common OpenZIM metadata according to our conventions
• Implement a build plugin which for now allows to install external dependencies (e.g. JS files)

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[benoit74]

Converting to draft because this is still missing some parts in the "build" hook:

• the check that file is already installed to not redo it many times for nothing
• the call to a custom tool to patch files installed (e.g. fixogvjs)

[rgaudin]

Pretty good ; I know it's in draft and you'll add stuff but at least this part is already reviewed.

[benoit74]

In fact, I propose to merge it like it is, anyway it works well but just has two missing features for which I have to ask questions, so I will open dedicated issues.

[rgaudin]

👍 Let's merge and open tickets