fix(nwis): forward get_record state, restore major-filter validation, clarify format

[thodson-usgs]

Summary

Three fixes in the (deprecated) nwis module, all surfaced by the package review.

1. get_record(state=…) was a dead parameter — accepted and documented, but never forwarded. get_record(state="OH", service="site") silently ignored it and, with no sites, failed with a confusing "Bad Request." Now forwarded as the NWIS stateCd major filter. (wide_format / datetime_index likewise remain accepted-but-unimplemented — unchanged here; wiring or removing them is a separate call for a deprecated module.)

2. The "must specify a major filter" validation was defeated. get_dv / get_iv / get_discharge_peaks did kwargs["sites"] = kwargs.pop("sites", sites), which always set the key (to None when absent), so query_waterservices' any(key in kwargs …) check always passed. get_dv() / get_iv() with no filter therefore gave a confusing "Bad Request" instead of the intended TypeError. Inject the filter only when actually provided.

3. format= collided. get_dv / get_iv passed format="json" explicitly and splatted **kwargs, so get_dv(sites=…, format="rdb") raised TypeError: got multiple values for 'format'. These getters parse JSON, so they now reject a non-json format with a clear ValueError.

Verification (no network)

get_dv()                       -> TypeError: ...must specify a major filter   (was: Bad Request)
get_dv(sites=…, format="rdb")  -> ValueError: get_dv returns JSON ...         (was: multiple values for 'format')
get_record(state="OH", ...)    -> forwards stateCd="OH"                       (was: silently dropped)

Added three regression tests; the full nwis suite (47) passes; ruff clean.

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