Create component to unify passenger mass calculations

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Assessment

Research direction

Description

Desired capability or behavior.

We should maybe add a component to calculate passenger_mass_with_bags so that we don't do it in preprocessors. This component should be added to GASP and FLOPS based mass so that users can use the same set of passenger variables to control aircraft design regardless of legacy code methods in Aviary.

Suggested implementation.

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3. Fork the repository and make your change on a branch.
4. Open a pull request that references the issue number.

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