Create sprint document for (Py)Arrow (#1834)

Added a new sprint document for (Py)Arrow including details about the
event, contact person, and relevant links.

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: rok

src/content/sprints/pyarrow.md

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+---
+title: "(Py)Arrow"
+numberOfPeople: "5" # How many people you expect to be able to accommodate.
+pythonLevel: "Any" # Any, Beginner, Intermediate, or Advanced.
+contactPerson: # The main person to reach out to regarding the sprint.
+  name: "Rok Mihevc"
+  email: "rok.mihevc@gmail.com"
+  github: "rok"
+links: # Add as many links as relevant.
+  - title: "PyArrow developer guide"
+    url: "https://arrow.apache.org/docs/developers/python/development.html"
+  - title: "Arrow issue tracker"
+    url: "https://github.com/apache/arrow/issues"
+---
+
+Apache Arrow is a universal columnar format and multi-language toolbox for fast
+data interchange and in-memory analytics.
+
+The project specifies a language-independent column-oriented memory format for
+flat and hierarchical data, organized for efficient analytic operations on
+modern hardware.
+
+Do you want to discuss something (Py)Arrow related? Let's discuss usage, issues,
+PRs, roadmap we'll be there on Saturday.