Improve SQLite grammar for check constraints #173
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Improve the SQLite grammar and support for check constraints.
This PR updates the grammar to parse check constraints with function calls, such as,
check(json_valid(vet_visits) and json_type(vet_visits) = 'array').Additionally, the expression and fields properties on the constraint object are set, whether the constraint is specified as part of a column definition, or separately within the table definition.