feat(soroban): detect cross-contract calls inside loops

[adeniran19-maker]

Closes #876

Summary of Changes

• Loop Cross-Contract Call Analyzer: Implemented packages/analyzers/soroban/calls/cross-contract-calls-in-loop-analyzer.ts to detect repeated external contract calls executed within loops.
• Loop Bound & Context Analysis:
  • classifyLoopHeader: Evaluates loop types (for, while, loop) and bounds (bounded_range, collection_iterator, unbounded, dynamic_condition).
  • Estimates cost multipliers and flags severity accordingly (critical for unbounded loops, high for dynamic iterations).
• Rule Definition & Integration:
  • Implemented packages/rules/soroban/src/calls/cross-contract-calls-in-loop-rule.ts (soroban-cross-contract-calls-in-loop).
  • Exported through packages/rules/soroban/src/calls/index.ts.
• Test Suite: Added unit test coverage in packages/rules/soroban/tests/cross-contract-calls-in-loop.spec.ts.

Verification

• Ran ./node_modules/.bin/jest packages/rules/soroban/tests/cross-contract-calls-in-loop.spec.ts (4/4 passing).

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