feat: Add get_streams_by_sender with paginated index

[Miraclechukwuemeka]

Summary

Closes #686

Adds get_streams_by_sender(sender: Address, page: u32, page_size: u32) -> Vec<u64> to the Soroban smart contract, enabling paginated queries for all streams created by a given sender.

Changes

• contracts/src/lib.rs:

  • Added SenderStreams(Address) variant to DataKey enum for the ledger index
  • Updated create_stream to maintain the sender streams index on stream creation
  • Updated create_split_stream to maintain the index (parent + all children)
  • Added get_streams_by_sender function with:
    • Zero-based pagination (page, page_size)
    • Max page size clamped to 100 to avoid storage read limits
    • Returns Vec<u64> of stream IDs in creation order
    • Returns empty vec for unknown senders

• contracts/src/test.rs — 6 new tests:

  • test_get_streams_by_sender_returns_all_stream_ids — verifies IDs returned in creation order
  • test_get_streams_by_sender_empty_for_unknown_sender — empty vec for unknown sender
  • test_get_streams_by_sender_pagination — correct slicing across 5 streams with page_size=2
  • test_get_streams_by_sender_includes_split_stream_children — split streams index parent + children
  • test_get_streams_by_sender_does_not_mix_senders — sender isolation
  • test_get_streams_by_sender_page_size_clamped_to_100 — oversized page_size is clamped

Acceptance Criteria

• Returns stream IDs in creation order
• Pagination correct for senders with 100+ streams (clamped to 100 per page)
• Empty vec for unknown sender

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