Add build and configuration improvements

[gawbul]

Priority: Low (Infrastructure)

Improvements

1. Add .python-version File

For tools like pyenv, mise, asdf:

echo "3.12" > .python-version

2. Add py.typed Marker

For PEP 561 compliance (distributing type information):

touch pyensemblrest/py.typed

Update pyproject.toml:

[tool.poetry]
packages = [
    { include = "pyensemblrest" },
]
include = ["pyensemblrest/py.typed"]

3. Add Security Scanning to CI

Add to .github/workflows/pull_request.yaml:

- name: Security check with Safety
  run: |
    poetry run pip install safety
    poetry run safety check

- name: Security check with Bandit  
  run: |
    poetry run pip install bandit
    poetry run bandit -r pyensemblrest/

4. Add Dependabot Configuration

Create .github/dependabot.yml:

version: 2
updates:
  - package-ecosystem: "pip"
    directory: "/"
    schedule:
      interval: "weekly"
    open-pull-requests-limit: 10
    
  - package-ecosystem: "github-actions"
    directory: "/"
    schedule:
      interval: "weekly"

5. Add Issue Templates

Create .github/ISSUE_TEMPLATE/bug_report.md:

---
name: Bug report
about: Create a report to help us improve
---

**Describe the bug**
A clear description of what the bug is.

**To Reproduce**
Steps to reproduce:
1. ...
2. ...

**Expected behavior**
What you expected to happen.

**Environment:**
- OS: [e.g. macOS, Linux]
- Python version: [e.g. 3.12]
- pyEnsemblRest version: [e.g. 0.8.0]

**Additional context**
Any other context about the problem.

6. Add Pull Request Template

Create .github/pull_request_template.md:

## Description
Brief description of changes

## Type of change
- [ ] Bug fix
- [ ] New feature
- [ ] Breaking change
- [ ] Documentation update

## Checklist
- [ ] Tests pass locally
- [ ] Added tests for new code
- [ ] Updated documentation
- [ ] Pre-commit hooks pass

Tasks

• Add .python-version file
• Add py.typed marker and update pyproject.toml
• Add security scanning to CI
• Add dependabot configuration
• Create issue templates
• Create PR template
• Add CODEOWNERS file if needed

Files to Create/Update

• .python-version (new)
• pyensemblrest/py.typed (new)
• pyproject.toml (update)
• .github/workflows/pull_request.yaml (update)
• .github/dependabot.yml (new)
• .github/ISSUE_TEMPLATE/ (new directory)
• .github/pull_request_template.md (new)

Note

The security scan mentioned in the push output shows 3 moderate vulnerabilities - should investigate those as part of this work.