Expose the method of boolean query

[alex-au-922]

Added the Occur enum, Query.boolean_query method and corresponding tests.

Expected usage:

@staticmethod
def boolean_query(subqueries: Sequence[tuple[Occur, Query]]) -> Query:
    ...

Query.boolean_query([(Occur.Must, query1), (Occur.MustNot, query2), (Occur.Should, query3)])

Important Changes

• Added a wrapper struct struct OccurQueryPair(Occur, Query) which lives in the lifetime of the python object subqueries for parsing list of tuple of Occur and Query
• Added the Clone implementation of Query class for the extract() method to extract Query class from the PyTuple

[cjrh]

Thanks!