feat: add parquet and excel exporters

[Siteshcodes]

Summary

Adds Parquet and Excel exporters to ScrapeResult.

Changes

• Add ScrapeResult.to_parquet(path) using pandas and PyArrow.
• Add ScrapeResult.to_excel(path) using pandas and openpyxl.
• Add .parquet and .xlsx extension dispatch to ScrapeResult.save().
• Add optional parquet and excel dependencies.
• Add clear ImportError messages with installation hints.
• Add tests for exporters, dependency handling, and save() dispatch.

Testing

• tests/test_core/test_models.py: 42 passed
• Full test suite: 568 passed, 2 skipped, 19 deselected

Closes #161

[Copilot]

🟡 Changes recommended

to_parquet()/to_excel() currently surface a pandas-missing ImportError that suggests installing the wrong extra (pyscrappy[dataframe]), which can mislead users trying to enable Parquet/Excel export.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

Adds Parquet and Excel export support to ScrapeResult, including save() dispatch by file extension and optional dependency extras to keep the core install lightweight.

Changes:

• Add ScrapeResult.to_parquet(path) and ScrapeResult.to_excel(path) implementations using pandas.
• Extend ScrapeResult.save(path) to dispatch .parquet and .xlsx.
• Add optional dependency extras and tests covering round-trips and missing optional deps.

File summaries

File	Description
src/pyscrappy/core/models.py	Adds to_parquet() / to_excel() and wires .parquet / .xlsx into save() extension dispatch.
tests/test_core/test_models.py	Adds tests for Parquet/Excel export, missing-dependency errors, and save() dispatch.
pyproject.toml	Introduces parquet and excel optional-dependency groups and includes them in the all extra.

Review details

• Files reviewed: 3/3 changed files
• Comments generated: 2
• Review effort level: Lite

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[vedaant00]

Thanks @Siteshcodes, nice first contribution. The per-format [parquet]/[excel] split is the right call — it matches the existing extras ([yaml], [stealth], [mcp]) and keeps Excel-only users from pulling pyarrow. Copilot's finding is fixed: the pandas-missing path now points at the right extra, and since both extras include pandas the hint resolves cleanly.

Verified locally: real round-trip tests, missing-dep errors, save() dispatch + parent-dir creation. 573 passed, ruff clean, CI green. Merging. Closes #161.