[Bug] `requirements-dev.txt` misses dependencies needed for local Python tests

### Search before asking

- [x] I searched in the [issues](https://github.com/apache/paimon/issues) and found nothing similar.

### Paimon version

`paimon-python/dev/requirements-dev.txt` is currently incomplete for local Python development. For example, basic test dependencies such as pytest are not fully represented there, so developers cannot rely on this file to set up a local environment for running Python tests.

As a result, local setup has to be inferred from the GitHub CI workflow, where many dependencies are installed manually in `.github/workflows/paimon-python-checks.yml`. This makes local development error-prone and easy to drift from CI.

### Compute Engine

Not related

### Minimal reproduce step

- Create a clean virtualenv
- Running `pip install -r dev/requirements-dev.txt`
- Running `pytest`, a lot of dependencies are missing, including `pytest` itself

### What doesn't meet your expectations?

`requirements-dev.txt` should include the common dependencies needed for local Python test development. After that, CI can reuse this file for the common setup, while keeping feature-specific dependencies installed separately when needed.

### Anything else?

_No response_

### Are you willing to submit a PR?

- [x] I'm willing to submit a PR!

Compare paimon-python/dev/requirements-dev.txt with the dependencies installed in .github/workflows/paimon-python-checks.yml, starting with the clean-virtualenv reproduction described in the issue. Ensure the shared local test dependencies are covered and verify that pip install followed by pytest works; CI should be able to reuse the common setup while retaining feature-specific installs.

Written by the indexing model from the issue text.