Add pyiceberg-core

[sumanth-manchala]

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.
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[github-actions]

Hi! This is the staged-recipes linter and your PR looks excellent! 🚀

[conda-forge-admin]

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/pyiceberg-core/recipe.yaml) and found some lint.

Here's what I've got...

For recipes/pyiceberg-core/recipe.yaml:

• ❌ The summary item is expected in the about section.
• ❌ There are too few lines. There should be one empty line at the end of the file.
• ❌ Non noarch packages should have python requirement without any version constraints.

_{This message was generated by GitHub Actions workflow run https://github.com/conda-forge/conda-forge-webservices/actions/runs/18485289650. Examine the logs at this URL for more detail.}

[conda-forge-admin]

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 (recipes/pyiceberg-core/recipe.yaml) and found it was in an excellent condition.

[sumanth-manchala]

@conda-forge/help-python, ready for review