Add sbmlmath to conda-forge feedstock

[kaiserls]

To make amici a conda-forge package, the dependencies, including this package, should be available as conda-forge package.
I created a conda-forge recipe for sbmlmath for the conda-feedstock: https://github.com/kaiserls/staged-recipes/tree/add-sbml

The recipe was created using the command grayskull pypi sbmlmath and tested with conda-smithy recipe-lint --conda-forge recipes/sbmlmath. Afterwards I adapted the recipe to use {{ python_min }}, which was suggested by the conda-smithy recipe linter. python_min is set to 3.9 by the conda-forge maintainers currently, which at the moment coincides with the minimal python version set in sbmlmath.

@dweindl : Would you be ok with being on the list of maintainers of the recipe and did the grayskull tool detect the license correctly as BSD-3?

PS: I also tested building the conda package locally with conda build <path/to/the/meta.yaml> ;)

Greetings

[dweindl]

Thanks, @kaiserls. Fine to be listed as maintainer, although I hope there won't be too much to maintain. BSD-3-clause is good.

[kaiserls]

Nice! Could you please comment in the PR that you are fine with being listed as maintainer?
conda-forge/staged-recipes#30694

[dweindl]

Nice! Could you please comment in the PR that you are fine with being listed as maintainer? conda-forge/staged-recipes#30694

Done. Sorry for the delay.