[INV-3662] Create Error Handler, move middleware to named files, create common Database caller

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Overview

This PR includes the following proposed change(s):

• Create modular error handler as a catch all

  • leverages the Request object to track filepaths instead of manual entry
  • utilizes the Logger
  • Overridable status code when used with the CustomError class
  • Closes #3662

• Moved middleware into named files for modularity

• Created common Database caller

  • Handles setup/teardown of database connections to be more DRY

• While the global error handler will function right away, the database caller will be implemented later in sprint

[sonarcloud[bot]]

Quality Gate failed

Failed conditions
0.0% Coverage on New Code (required ≥ 80%)

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