Bmi_Adapter: drop 'StreamHandler output'

[PhilMiller]

The entire hierarchy of classes below Bmi_Adapter takes StreamHandler output as a constructor argument, and just passes it up the chain. The only places it was actually used was in a pair of re-initialization warnings.

Changes

• Change the warnings to use logging::warning instead
• Drop the Bmi_Adapter::output member that was otherwise unused
• Drop the StreamHandler output parameter from all class constructors in the hierarchy
• Remove output arguments used to fill those parameters in adapter construction calls

Testing

1. ctest
2. CI

Notes

• The Formulation classes are minimally changed, and particularly did not get into modifying their interfaces

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
• Project documentation has been updated (including the "Unreleased" section of the CHANGELOG)
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[program--]

Looks good to me, the comments are nitpicks if anything. I'll wait to merge till tomorrow so there's a bit more visibility, since this might affect some in-dev PRs (i.e. Forcings Engine ones). Should be quick/easy changes for those though.

[PhilMiller]

I just test-merged with your Forcings Engine PR branch, and found a couple missing headers. Added the <iostream> here, and that'll need a utilities/StreamHandler.hpp.