Add optional device_mac_address parameter to get_consumption_info

[BradKollmyer]

Closes #69

What this does

The /api/v2/water/consumption endpoint accepts a macAddress query parameter to scope results to a single device, same as /water/metrics. Today get_consumption_info only sends locationId, so locations with multiple Flo devices can only get the location-wide aggregate (which shows incorrect data, e.g. in the Home Assistant integration).

This adds an optional device_mac_address parameter to get_consumption_info, sent as macAddress with : separators stripped, matching how get_metrics handles MACs. Omitting it preserves the existing behavior, so the change is backwards compatible.

location_info = await api.location.get_info(location_id)
for device in location_info["devices"]:
    consumption = await api.water.get_consumption_info(
        location_id, start, end, device_mac_address=device["macAddress"]
    )

Also included

While running the test suite I hit a latent bug in API._request: resp.json() ran before raise_for_status(), so non-JSON error bodies (plain-text or HTML error pages) escaped as raw JSONDecodeError instead of being wrapped in RequestError. Swapped the order so HTTP errors are always raised as RequestError. This also fixes test_system_modes, which was failing because of it.

Testing

• Extended test_get_consumption_info to cover the per-device call
• Full suite passes: 15 passed

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