Add recipe for fatrop

[traversaro]

fatrop is a nonlinear optimal control problem solver that aims to be fast, support a broad class of optimal control problems and achieve a high numerical robustness.

The package name (libfatrop) contains the lib prefix as requested in #19764 (review) for C/C++ libraries. The feedstock is named fatrop to match the repo name and support different package outputs in the future, if that turns out to be necessary.

I am adding fatrop as it is a dependency for a new version of the casadi library, see conda-forge/casadi-feedstock#112 .

At the moment the package is built only for Linux as its dependency blasfeo is only available for Linux.

Checklist

• Title of this PR is meaningful: e.g. "Adding my_nifty_package", not "updated meta.yaml".
• License file is packaged (see here for an example).
• Source is from official source.
• Package does not vendor other packages. (If a package uses the source of another package, they should be separate packages or the licenses of all packages need to be packaged).
• If static libraries are linked in, the license of the static library is packaged.
• Package does not ship static libraries. If static libraries are needed, follow CFEP-18.
• Build number is 0.
• A tarball (url) rather than a repo (e.g. git_url) is used in your recipe (see here for more details).
• GitHub users listed in the maintainer section have posted a comment confirming they are willing to be listed there.
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[conda-forge-webservices]

Hi! This is the friendly automated conda-forge-linting service.

I wanted to let you know that I linted all conda-recipes in your PR (recipes/fatrop/meta.yaml) and found some lint.

Here's what I've got...

For recipes/fatrop/meta.yaml:

• Please do not delete the example recipe found in recipes/example/recipe.yaml.

[traversaro]

@conda-forge/staged-recipes @conda-forge/help-c-cpp the PR is ready for review.

The linter complains "Please do not delete the example recipe found in recipes/example/recipe.yaml.", but as the file has not been touched by this PR. The problem is tracked in #27242 .

[github-actions]

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