Improved the _ravenpy_models.py script to be able to specify the rain snow fraction for all models

[lou-a]

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• This PR addresses an already opened issue (for bug fixes / features)
  • This PR fixes #xyz
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What kind of change does this PR introduce?

Improved the _ravenpy_models.py script to be able to specify the rain snow fraction for all models, including HBVEC. With the new version of RavenPy (v0.16.0, unreleased), the rain_snow_fraction could be set with "RainSnowFraction=rain_snow_fraction" in the self.default_emulator_config dictionary. See: CSHS-CWRA/RavenPy#408. For now (based on the latest release RavenPy version, v0.15.0) the change I'm suggesting here will enable changing the rain snow fraction algorithm for HBVEC as well.

Does this PR introduce a breaking change?

None foreseen.

Other information:

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[richardarsenault]

Looks good. Did not know that this command structure (rain_snow_fraction vs RainSnowFraction keyword) worked too, but it seems the tests are passing.

[lou-a]

Looks good. Did not know that this command structure (rain_snow_fraction vs RainSnowFraction keyword) worked too, but it seems the tests are passing.

Thank you for checking, Richard. You can use either terms for most emulators, depending on the aliases they use for the processes. Same for other processes, as far as I know. For this specific example, the rain snow fraction process is defined like so in most emulators: o.RainSnowFraction = Field("RAINSNOW_HBV", alias="RainSnowFraction"), where the alias is key to being able to call RainSnowFraction. In HBVEC this was defined without any alias (fixed in RavenPy v0.16.0): o.RainSnowFraction = Field("RAINSNOW_HBV").