Add commands for setting date and time

[allenporter]

Add separate commands for setting the date and time of the device. This requires rewriting the encoding/decoding libraries using the new sipcommand format that can specify arguments in the same format as the responses.

Fixes #57

Example command:

$ python3 examples/rainbird_tool.py --log-level=debug set_current_date 2023-01-09
DEBUG:pyrainbird.async_client:Request to line: 130917E7
DEBUG:pyrainbird.async_client:Request: {"id": 1673419656.7081575, "jsonrpc": "2.0", "method": "tunnelSip", "params": {"data": "130917E7", "length": 4}}
DEBUG:pyrainbird.async_client:Response: {"jsonrpc": "2.0", "result":{"length":2, "data":"0113"}, "id": 0}
DEBUG:pyrainbird.async_client:Response from line: 0113
DEBUG:pyrainbird.async_client:Response: {'type': 'AcknowledgeResponse', 'commandEcho': 19}
None
$ python3 examples/rainbird_tool.py --log-level=debug get_current_date
DEBUG:pyrainbird.async_client:Request to line: 12
DEBUG:pyrainbird.async_client:Request: {"id": 1673419658.5084407, "jsonrpc": "2.0", "method": "tunnelSip", "params": {"data": "12", "length": 1}}
DEBUG:pyrainbird.async_client:Response: {"jsonrpc": "2.0", "result":{"length":4, "data":"920917E7"}, "id": 0}
DEBUG:pyrainbird.async_client:Response from line: 920917E7
DEBUG:pyrainbird.async_client:Response: {'type': 'CurrentDateResponse', 'day': 9, 'month': 1, 'year': 2023}
2023-01-09