Setting to enable or disable DB query logging

[kmcginnes]

Description

Adds a new setting for enabling or disabling logging of the database queries for Graph Explorer operations.

• Default value is disabled
• Applies to all queries across all connections that use the proxy server
• Setting is communicated to the server through a new HTTP header db-query-logging-enabled
• If the setting is missing it is assumed disabled

Other changes

I went down some alternative paths that contained some cleanup of existing code. I'm including those here, but can break them out to a separate PR if desired.

• Don't log requests for CORS OPTIONS method to reduce logger noise
• Updated random data functions for tests so that when generating undefined values the properties won't be on the resulting object
  • In JavaScript prop: undefined is treated differently than an "undefined" prop (a prop that doesn't exist on an object)
• Move configuration merging logic to a separate function (no logic changed)
  • Added some tests around the configuration merging logic
  • Added type for user styling
  • Added activeConfigSelector to get the config that is active out of the Map (similar to activeSchemaSelector)
• Added concrete type for the options param to Explorer functions (was any before)

Validation

Related Issues

• Resolves [Task] Add configuration in settings page to disable database query logging #540
• Resolves [Task] Validate environment value configuration #556

Check List

• I confirm that my contribution is made under the terms of the Apache 2.0
  license.
• I have run pnpm checks to ensure code compiles and meets standards.
• I have run pnpm test to check if all tests are passing.
• I have covered new added functionality with unit tests if necessary.
• I have added an entry in the Changelog.md.