test(scenarios): add createDataSet smoke scenario

[galargh]

Related to #121

This introduces createDataSet scenraio described in the related issue. Combined with the other proposed additions related to the issue, it will allow us to fully test the partial upgrade scenario.

Testing

• CI
• Nightly Build - TODO

[galargh]

TLDR

1. Load devnet-info.json.
2. Pick USER_2 by default.
3. Pick the first approved PDP service provider.
4. Build a Synapse client for that user on the devnet chain.
5. Create unique smoke-test metadata so this dataset can be identified later.
6. Ask the SDK to create a storage context for that provider and metadata.
7. Run synapse.storage.prepare(...) for a tiny dataset size.
8. If prepare says funds or approvals are needed, submit those transactions:
   • ERC20 approval
   • FilecoinPay deposit
   • FWSS operator approval
9. Directly call SP.createDataSet(...).
10. Wait for SP.waitForCreateDataSet(...) to confirm dataset creation.
11. Fetch datasets through synapse.storage.findDataSets().
12. Assert the new dataset exists and has the expected properties:
    • positive dataset ID
    • live
    • managed
    • correct payer
    • correct provider/payee
    • matching smoke metadata