[Security Solution] Implement prebuilt rule installation/_review API endpoint

[banderror]

Epic: https://github.com/elastic/security-team/issues/1974 (internal)
Related to: #144060, #148181

Summary

Based on the API design made in #144060, implement the new rule installation/_review API endpoint and hide it behind the feature flag. See the draft implementation in the POC.

POST /internal/detection_engine/prebuilt_rules/installation/_review

Response body:

export interface ReviewRuleInstallationResponseBody {
  status_code: number;
  message: string;
  attributes: {
    /** Aggregated info about all rules available for installation */
    stats: RuleInstallationStatsForReview;
    /** Info about individual rules: one object per each rule available for installation */
    rules: RuleInstallationInfoForReview[];
  };
}

export interface RuleInstallationStatsForReview {
  /** Number of prebuilt rules available for installation */
  num_rules_to_install: number;
  /** A union of all tags of all rules available for installation */
  tags: RuleTagArray;
}

// Option 1: rule ids and versions + all fields from DiffableRule
// Option 2: rule ids and versions + selected fields from DiffableRule (depending on the rule type)
export type RuleInstallationInfoForReview = DiffableRule & {
  rule_id: RuleSignatureId;
  rule_content_version: SemanticVersion;
  stack_version_min: SemanticVersion;
  stack_version_max: SemanticVersion;
};

[elasticmachine]

Pinging @elastic/security-detections-response (Team:Detections and Resp)

[elasticmachine]

Pinging @elastic/security-solution (Team: SecuritySolution)