Py-partiql-parser

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- Increased support for WHERE-clauses:
1. Nested clauses
2. OR-clauses
3. Functions: attribute_type, IF (NOT) MISSING, comparison operators (<, >)

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- The DynamoDBStatementParser now expects a document in the DynamoDB format:
{"a1": {"S": "b1"}, "a2": {"S": "b2"}}

- Adds validation for tables that start with a number
- Adds support for queries that have a table name surrounded by quotes

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- Support JSON documents containing (lists of) BOOLeans

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- Allow where-clauses for lists, such as `where a[1] = '..'`

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- Packaging improvements: Include source-files in the release, and update the version nr

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- Packaging improvements: Include `tests/__init__.py` in the release and add project links to PyPi