Add GraphQL types and models for API fuzzing configuration

What does this MR do?

Adds models and GraphQL types for configuring API Fuzzing

The GraphQL types follow the structure of the SAST configuration types:

• Types::CiConfiguration::ApiFuzzing::Type
• Types::CiConfiguration::ApiFuzzing::ScanModeEnum
• Types::CiConfiguration::ApiFuzzing::ScanProfile

Models:

• Security::ApiFuzzing::CiConfiguration
• Security::ApiFuzzing::ScanProfile

GraphQL query and response

This query:

{
  project(fullPath: "my-namespace/my-project") {
    apiFuzzingCiConfiguration {
      scanModes
      scanProfiles {
        name
        description
        yaml
      }
    }
  }
}

produces the following response:

{
  "data": {
    "project": {
      "apiFuzzingCiConfiguration": {
        "scanModes": [
          "HAR",
          "OPENAPI"
        ],
        "scanProfiles": [
          {
            "name": "Quick-10",
            "description": "Fuzzing 10 times per parameter",
            "yaml": "---\n:Name: Quick-10  # truncated here for brevity \n"
          },
          {
            "name": "Medium-20",
            "description": "Fuzzing 20 times per parameter",
            "yaml": "---\n:Name: Medium-20  # truncated here for brevity \n"
          },
          {
            "name": "Medium-50",
            "description": "Fuzzing 50 times per parameter",
            "yaml": "---\n:Name: Medium-50  # truncated here for brevity \n"
          },
          {
            "name": "Long-100",
            "description": "Fuzzing 100 times per parameter",
            "yaml": "---\n:Name: Long-100  # truncated here for brevity \n"
          }
        ]
      }
    }
  }
}

Issue

This is the first backend MR for #299234 (closed). The next MR will include the mutation for providing code snippets based on the configuration input