engine: `update_call_stack` uses string matching on `Debug` output to detect cross-contract calls

[Timi16]

File: src/debugger/engine.rs — DebuggerEngine::update_call_stack

The method checks event_str.contains("ContractCall") where event_str is the {:?} debug representation. This is fragile — any rename of the variant or change to Debug formatting silently breaks cross-contract call tracking.

Proposal: Match on the event enum variant directly instead of its string representation.

[Jumongweb]

@Jumongweb has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Hi maintainer, i will like to solve this issue

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