Gitá

Many changes

• Date columns of some OData API endpoints are now formatted in the returned Dataframe (Issue #3)
• New methods ODataQuery.raw and ODataQuery.text
• Created class bcb.ODataAPI to directly wrap OData APIs
• Updated documentation
• Updated pyproject.toml
• Updated documentation
• Migrated to poetry
• Added httpx to install_requirements
• Updated docs
• sgs.TaxaJuros upgraded to v2
• Updated README
• Updated requirements files including httpx
• Added autosummary_generate to sphinx conf.py
• Implemented the definitive wrapper for OData APIs.
  • A few APIs have been unlocked: Expectativas, PTAX, taxaJuros, MercadoImobiliario, SPI
• Updated documentation