Snuba-sdk

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- Fix for a bug in 0.1.2 where parent_api was incorrectly validated

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- Modify ALIAS_RE to allow round brackets
- Surround alias in `AliasedExpression` and `CurriedFunction` with backticks on query visitor
when translating a Query Object to a SNQL Query

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- Add support for ``team`` and ``feature`` tags for attribution in Snuba

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- Add support for lambdas and identifiers, which in turn enable higher order functions like `arrayMap`.

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- Move to Python 3.8 and drop support for Python 3.6. Sentry is now using 3.8 so this library can upgrade as well.
- Use __future__.annotations where necessary
- Update all dependencies to latest and fix subsequent linting errors
- Correctly chain exceptions
- Follow PEP naming conventions for Exceptions: https://www.python.org/dev/peps/pep-0008/#exception-names
- Add Data Model concept to Entities for extra validation
- Create a type alias for sequences of conditions
- Use sequences for LIMIT BY and ARRAY JOIN since Snuba now supports those operations over multiple columns

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- New release to fix dataclasses import issue with 3.8