Security Factory: compareWithGeneratedHMAC

Add a factory that allows to compare 2 inputs with a generated HMAC. 

Useful for Github or Twitch webhooks


Example of config (not final)
```yaml
  security:
  - getHeader:
      name: X-Hook-Secret
  - compareWithGeneratedHMAC:
      secret: '{{ .env.HOOK_SECRET }}'
      algorithm: sha256
```