feat: support rate limits

[dk-lockdown]

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[dk-lockdown]

Supports separate setting of rate limiting rules for CRUD requests.

  - name: rateLimiterFilter
    kind: RateLimiterFilter
    conf:
      # 1000 requests per second
      insert_limit: 1000
      # 1000 requests per second
      update_limit: 1000
      # 1000 requests per second
      delete_limit: 1000
      # 1000 requests per second
      select_limit: 1000