Add GraphQL types

What does this MR do and why?

Final part of #563376

• Add ConditionType, RuleType GraphQL types
• Add rules field to SpecType
• Add BaseInput#rules accessor
• RuleType converts expressionz to json via RulesConverter

References

#563376

MR	Status	Description
Input lexeme	!206891 (merged)	Parse $[[ inputs.X ]] syntax in expressions
Rules converter	In review: !209135 (merged)	Convert expression AST to JSON
Semantic validation	In review: !209496	Validate input references and circular dependencies, error handlin
GraphQL API	👈 You are here	Expose rules with condition trees

How to set up and validate locally

query:

  query {
    project(fullPath: "root/house-of-1000-pipelines") {
      ciPipelineCreationInputs(ref: "main") {
        name
        type
        options
        rules {
          if                    
          conditionTree {       
            operator
            field
            value
            children {
              operator
              field
              value
            }
          }
          options
          default
        }
      }
    }
  }

response will be something like:

{
  "data": {
    "project": {
      "ciPipelineCreationInputs": [
        {
          "name": "deployment_type",
          "type": "STRING",
          "options": [
            "rolling",
            "blue_green",
            "canary"
          ],
          "rules": null
        },
        {
          "name": "target_environment",
          "type": "STRING",
          "options": [
            "development",
            "staging",
            "production"
          ],
          "rules": null
        },
        {
          "name": "resource_tier",
          "type": "STRING",
          "options": null,
          "rules": [
            {
              "if": "$[[ inputs.target_environment ]] == \"development\"",
              "conditionTree": {
                "operator": "equals",
                "field": "target_environment",
                "value": "development",
                "children": null
              },
              "options": [
                "small",
                "medium"
              ],
              "default": "small"
            },
            {
              "if": "$[[ inputs.target_environment ]] == \"staging\"",
              "conditionTree": {
                "operator": "equals",
                "field": "target_environment",
                "value": "staging",
                "children": null
              },
              "options": [
                "medium",
                "large"
              ],
              "default": "medium"
            },
            {
              "if": "$[[ inputs.target_environment ]] == \"production\" && $[[ inputs.deployment_type ]] == \"canary\"",
              "conditionTree": {
                "operator": "AND",
                "field": null,
                "value": null,
                "children": [
                  {
                    "operator": "equals",
                    "field": "target_environment",
                    "value": "production"
                  },
                  {
                    "operator": "equals",
                    "field": "deployment_type",
                    "value": "canary"
                  }
                ]
              },
              "options": [
                "large",
                "xlarge",
                "xxlarge"
              ],
              "default": "large"
            },
            {
              "if": "$[[ inputs.target_environment ]] == \"production\"",
              "conditionTree": {
                "operator": "equals",
                "field": "target_environment",
                "value": "production",
                "children": null
              },
              "options": [
                "large",
                "xlarge"
              ],
              "default": "xlarge"
            },
            {
              "if": null,
              "conditionTree": null,
              "options": [
                "small"
              ],
              "default": null
            }
          ]
        }
      ]
    }
  },
  "correlationId": "01K8AXA1M0NV1RHVAD4TFT5X80"
}

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