feat: add ISSUE-190 Soroban transaction event monitor example

README.md

@@ -164,6 +164,7 @@ The repository currently includes the following runnable examples:
 51. **`54-fee-stats`**: Inspecting network fee statistics, fee percentiles, capacity usage, and recommended fee values.
 52. **`57-account-reserve-calculator`**: Calculating account minimum reserve requirements and available XLM balance from ledger entry breakdowns.
 53. **`58-account-relationship-discovery`**: Discovering and grouping account relationships including signers, asset issuers, sponsorships, and counterparties.
+54. **`190-soroban-transaction-event-monitor`**: Monitoring a submitted Soroban transaction by polling for its terminal state, extracting and decoding emitted contract events and diagnostic events, grouping them by contract and event type, and preserving raw XDR alongside decoded values.
 54. **`192-soroban-contract-code-inspection`**: Inspecting Soroban contract code metadata, extracting the deployed code identifier, retrieving TTL and ledger information, and optionally comparing a supplied WASM hash against the on-chain code identifier.
 54. **`66-ledger-effects`**: Retrieving every effect produced by one closed ledger, grouping them by effect type and category, and summarizing the state changes a ledger introduced.
 55. **`67-soroban-contract-events`**: Querying Soroban contract events over a ledger range, decoding event topics and data payloads, and reporting the ledger and transaction that produced each event.