feat: add optional timeout parameter to API request methods

[TordAreStromsnes]

Timeout support added to API methods:

• All core request methods (_request, _request_binary, _request_binary_stream) and their interfaces now accept an optional timeout parameter, which can be a float or a (connect, read) tuple.
• The _make_request_with_retry internal method now supports the timeout parameter, ensuring actual HTTP requests respect the specified timeout.

Bulk data and streaming enhancements:

• get_bulk_data and get_bulk_data_stream in _bulk_data.py now accept and pass through the timeout parameter, enabling timeout control for large/binary data downloads.

Pagination and query improvements:

• Pagination helpers (_fetch_next_page, _yield_nextlink_pages) in _pagination.py now accept and propagate the timeout parameter, ensuring paginated requests are also covered.
• The main query execution method (execute_query) now supports a timeout parameter for full end-to-end timeout control on queries.

Type hinting and imports:

• All affected modules now import Union and update type hints to reflect the new timeout parameter signatures.

Documentation updates:

• All updated methods include expanded docstrings to explain the new timeout parameter and its usage.

These changes collectively provide fine-grained control over network request timeouts, improving reliability and user experience for all DSIS client API operations.