doc: add use cases and benchmark description

Check-in the final version of the use cases / benchmark document, originally written in swh/meta$458 for #1885 (closed).

In this version I've:

• integrated the latest changes from @grouss (with minor editing)
• removed the obsolete links to API proposals that have been implemented since
• converted the markup to rst, for consistency with our Python documentation

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Migrated from D1738 (view on Phabricator)

Awesome doc, thanks! Here are a few quick comments.

• use cases doc: fix typo and remove out-of-scope comments

• doc: add use cases and benchmark description
• use cases doc: fix typo and remove out-of-scope comments
• use case doc: update edge restrictions for provenance use cases

• use case doc: update edge restrictions for provenance use cases

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