add shm_size based on ShmSize

[richard-burhans]

Added shm_size as a requirement based on CWL's ShmSize. I added this so it could be used in the NCBI FCS GX tool, hoping to clean up the current solution.

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• I've included appropriate automated tests.
• This is a refactoring of components with existing test coverage.
• Instructions for manual testing are as follows:
  1. [add testing steps and prerequisites here if you didn't write automated tests covering all your changes]

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[mvdbeek]

Awesome, thank you!

[github-actions]

This PR was merged without a "kind/" label, please correct.