Jwade reservoir da

[jswade-rtx]

Adds support for reservoir RFC data assimilation in t-route, controlled by a new optional [DataAssimilation] section in input.config (reservoir_da bool, reservoir_rfc_dir path). Only applies to default, forecast, and regionalization runs. Reservoir DA not permitted for calibrations.

Adds DataAssimilationConfig/DataAssimilation field to InputConfig, with validation that reservoir_rfc_dir exists when reservoir_da is True. create_troute_config and update_troute now accept da_sec and population the t-route reservoir_rfc_da block accordingly.

This PR also turns on t-route's lakeout_output by default.

Duplicating PR from development.