feat: add getApprovals to PhishingController

[AugmentedMode]

Summary

• Adds getApprovals method to PhishingController that wraps the security alerts API POST /address/evm/approvals endpoint (Blockaid's approvals endpoint)
• Returns token approvals for an EVM address with security enrichments (verdict, spender info, exposure data, allowance details)
• Follows the existing scanAddress pattern (input validation, chain resolution, safelyExecuteWithTimeout) but intentionally does not cache — the frontend manages state

Changes

• src/types.ts — Added ApprovalResultType/ApprovalFeatureType enums and types: Approval, ApprovalsResponse, Allowance, ApprovalAsset, Exposure, Spender, ApprovalFeature
• src/PhishingController.ts — Added APPROVALS_ENDPOINT constant, PhishingControllerGetApprovalsAction action type, messenger registration, and getApprovals method
• src/index.ts — Exported all new types and enums
• src/PhishingController.test.ts — Added 8 test cases covering: valid response, missing address/chainId, unknown chain, HTTP errors, timeout, address/chainId normalization

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Note

Medium Risk
Adds a new networked controller action (getApprovals) that calls an external Security Alerts API and changes the public API surface via new exported types; failures are handled by returning empty results, but correctness depends on chain support/normalization and endpoint behavior.

Overview
Adds token-approval fetching to PhishingController. Introduces getApprovals (and messenger action PhishingController:getApprovals) to call POST /address/evm/approvals on the Security Alerts API with a 5s timeout, normalizing chainId/address and returning { approvals: [] } for invalid inputs, unsupported chains, HTTP errors, or timeouts.

Expands exported approval typing and chain gating. Adds approval-related enums/types (ApprovalsResponse, Approval, etc.), a fixed allowlist of supported approval chains plus isApprovalSupportedChain, updates package exports, adds comprehensive unit tests for success/error/timeout/normalization paths, and updates the changelog and eslint suppression tracking.

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