Shillelagh

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- Fix DML bug in GSheets with a middle nameless column

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- Relax ``google-auth`` dependency

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- Fix ``SELECT`` bug in GSheets with a middle nameless column

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- Relax SQLAlchemy dependency

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- Add support for DML to the GSheets adapter
- GSheets dialect now return "main" as its schema
- Schema prefix can now be used on table names
- GSheets now supports defining a catalog of spreadsheets
- Improve many small bugs in the type conversion system
- Add ``sleep``, ``version``, and ``get_metadata`` functions
- Add REPL command-line utility (``shillelagh``)
- Remove ``adapter_args``, use only ``adapter_kwargs`` now

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- Parse bindings in ``execute``, allowing native Python types
- Allow configuring adapters via kwargs in addition to args