Add sparse simplex, transport, and Birkhoff projections from JAXopt #1545
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I have set it up so one can feed the solver for Transport/Birkhoff projections via make_solver argument. @carlosgmartin for this PR is this enough (as the tests are namesake for these) or should I only port the sparse_simplex for now?
Continuation of #1280, #1351 and #1439