Add coin-or stack

[BastianZim]

Checklist

• Used a personal fork of the feedstock to propose changes
• Bumped the build number (if the version is unchanged)
• Reset the build number to 0 (if the version changed)
• Re-rendered with the latest conda-smithy (Use the phrase @conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• Ensured the license file is being packaged.

Closes #1991

cc @wolfv

[conda-forge-linter]

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

I just wanted to let you know that I linted all conda-recipes in your PR (recipe) and found it was in an excellent condition.

[isuruf]

We should first make coincbc package a meta package before using the new coin-or-cbc package.

[BastianZim]

@isuruf Should coincbc be an output of coin-or-cbc and coincbc-feedstock be archived, or should coincbc be empty and depend on coin-or-cbc?

[isuruf]

First option is preferred.

[BastianZim]

Has been introduced in conda-forge/coin-or-cbc-feedstock#11

[BastianZim]

@isuruf Would you mind merging this now?

[BastianZim]

Thank you!