Issue #3520925: Support optional configuration overrides for site_key and secret_key

brevilorequested to merge
issue/hcaptcha-3520925:3520925-support-credential-overrides into 8.x-1.x
  • Use settings.local.php to store credentials outside of configuration (optional)
  • When overrides are in place, UI fields are disabled but show active values
  • See changes to README.md for more

Closes #3520925

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