feat(soroban): implement token call cost aggregator

[adeniran19-maker]

Closes #873

Summary of Changes

• Token Call Cost Aggregator: Implemented packages/analyzers/soroban/tokens/cost/token-cost-aggregator.ts to estimate and aggregate resource costs across Soroban token contract calls.
• Resource Benchmarking: Defined TOKEN_METHOD_BENCHMARKS capturing CPU instructions, memory bytes, and ledger read/write bytes for standard SEP-41 token calls (transfer, transfer_from, balance, approve, mint, burn, clawback, allowance, decimals, etc.).
• Categorization & Aggregation:
  • groupCostsByOperation: Groups and ranks token method costs by operation with percentage of total CPU consumption.
  • groupCostsByAsset: Groups token calls by asset identifier and identifies the dominant operation per asset.
  • aggregateTokenCosts: Produces overall metrics, identifies dominant assets/operations, and generates actionable optimization recommendations (e.g. hoisting loop calls, batching transfers, caching balances).
• Test Suite: Added unit test coverage in packages/analyzers/soroban/tokens/cost/__tests__/token-cost-aggregator.spec.ts.

Verification

• Ran ./node_modules/.bin/jest packages/analyzers/soroban/tokens/cost/__tests__/token-cost-aggregator.spec.ts (5/5 passing).

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