Add first draft CONUS test cases

[sclaw]

This PR adds a new test to the nhf test suite with a CONUS-wide dataset. This test runs t-route for a portion of the 2022 US summer floods over all of CONUS. Channel forcing data is retrieved from National Water Model 3.0 retrospective data. This test is more a test of the nhf data than of t-route code. For that reason, these tests should not be run in the default pytest test set. The test_nhf_conus function has therefore been marked as an integration test.

Additions

• test/nhf/conus/make_forcing.py
• test/nhf/conus/README.md
• test/nhf/test_conus.py

Removals

• None

Changes

• None

Testing

1. Issues with nhf 0.4.1 prevented t-route from running on the test dataset.

Screenshots

Notes

• Due to the large size of both the CONUS nhf and the channel forcing data for t-route, no data has been included in this PR. Users should copy nhf to their local machine and follow the instructions in test/nhf/conus/README.md to create the dataset and setup the test directory.
• One of the existing tests was failing, and no attempt has been made to resolve it. test_hyfeatures_network.py fails because lake_id field is not available. Tadd noted this here: patch: fixed broken lower colorado test #31. This test should be removed. Line 138 (nexus) also broken for that test. yuqiong e3a4998

Todos

• Issues with nhf 0.4.1 prevented t-route from running on the test dataset. Once the issues are resolved, the simulation time-window may be adjusted to better match event start and end times.
• More tests are needed to determine if the t-route run for this is successful, once the nhf 0.4.1 issue is resolved.

Checklist

• PR has an informative and human-readable title
• Changes are limited to a single goal (no scope creep)
• Code can be automatically merged (no conflicts)
• Code follows project standards (link if applicable)
• [] Passes all existing automated tests
• Any change in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output)
• Placeholder code is flagged / future todos are captured in comments
• Visually tested in supported browsers and devices (see checklist below 👇)
• Project documentation has been updated (including the "Unreleased" section of the CHANGELOG)
• Reviewers requested with the Reviewers tool ➡️