wboayue / rust-ibapi / 24292071653

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add outbound protobuf encoders (Phase 4) (#451)

* add outbound protobuf encoders (Phase 4)

Shared domain→proto converters in src/proto/encoders.rs for Contract,
Order, ComboLeg, DeltaNeutralContract, SoftDollarTier, ExecutionFilter,
ScannerSubscription, and OrderCondition types.

Domain-specific proto encoders added to all 10 modules: orders,
contracts, market_data (realtime, historical, mod), accounts, news,
scanner, display_groups, and wsh. 57 proto encoder functions total,
each producing binary payloads with +200 message ID offset.

93 new unit tests verify message framing and roundtrip decode.

* fix cancel message IDs, cancel_account subscribe flag, add missing test

- encode_cancel_histogram_data_proto: RequestHistogramData → CancelHistogramData
- encode_cancel_head_timestamp_proto: RequestHeadTimestamp → CancelHeadTimestamp
- encode_cancel_account_updates_proto: subscribe None → Some(false)
- add test for encode_request_market_data_type_proto
- add test for encode_cancel_histogram_data_proto

* extract encode_cancel_by_id and encode_empty_proto macros

Replace 23 boilerplate proto encoder bodies (17 cancel-by-id,
6 empty-request) with shared macros in proto/encoders.rs.

* extract assert_proto_msg_id to shared test utils

Replace 7 identical local assert_msg_id helpers with shared
assert_proto_msg_id in common::test_utils::helpers.

* add roundtrip decode assertions, simplify quantity encoding

- realtime/historical/accounts proto tests now verify decoded field
  values (req_id, contract.symbol, tick_type, etc.), not just msg_id
- encode_order: inline total_quantity/filled_quantity zero checks,
  remove post-hoc mutation

* fix server_time/server_time_millis protobuf decoding

Server v220 responds with protobuf CurrentTime/CurrentTimeInMillis
messages. Add decode_server_time to handle both protobuf and text
formats, replacing the inline text-only decoder in sync and async.

* fix protobuf response routing and account_summary decoding

- sync ... (continued)

473 of 608 new or added lines in 14 files covered. (77.8%)

9893 of 11597 relevant lines covered (85.31%)

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