v1.176.0

# NautilusTrader 1.176.0 Beta

Released on 31st July 2023 (UTC).

### Enhancements
- Implemented string interning with the [ustr](https://github.com/anderslanglands/ustr) library, thanks @twitu
- Added `SyntheticInstrument` capability, including dynamic derivation formulas
- Added `Order.commissions()` convenience method (also added to state snapshot dictionaries)
- Added `Cache` position and order state snapshots (configure via `CacheConfig`)
- Added `CacheDatabaseConfig.timestamps_as_iso8601` to persist timestamps as ISO 8601 strings
- Added `LiveExecEngineConfig.filter_position_reports` to filter position reports from reconciliation
- Added `Strategy.cancel_gtd_expiry` to cancel managed GTD order expiration
- Added Binance Futures support for modifying `LIMIT` orders
- Added `BinanceExecClientConfig.max_retries` option (for retrying order submit and cancel requests)
- Added `BinanceExecClientConfig.retry_delay` option (the delay between retry attempts)
- Added `BinanceExecClientConfig.use_reduce_only` option (default true to retain current behavior)
- Added `BinanceExecClientConfig.use_position_ids` option (default true to retain current behavior)
- Added `BinanceExecClientConfig.treat_expired_as_canceled` option (default false to retain current behavior)
- Added `BacktestVenueConfig.use_reduce_only` option (default true to retain current behavior)
- Added `MessageBus.is_pending_request(...)` method
- Added `Level` API for core `OrderBook` (exposes the bid and ask levels for the order book)
- Added `Actor.is_pending_request(...)` convenience method
- Added `Actor.has_pending_requests()` convenience method
- Added `Actor.pending_requests()` convenience method
- Added `USDP` (Pax Dollar) and `TUSD` (TrueUSD) stablecoins
- Improved `OrderMatchingEngine` handling when no fills (an error is now logged)
- Improved `Binance` live clients logging
- Upgraded Cython to 3.0.0 stable

### Breaking Changes
- Moved `filter_unclaimed_external_orders` from `ExecEngineConfig` to `LiveExecEngineConfig`
- All `Actor.request_*` methods no longer take a `request_id`, but now return a `UUID4` request ID
- Removed `BinanceExecClientConfig.warn_gtd_to_gtd` (now always an `INFO` level log)
- Renamed `Instrument.native_symbol` to `raw_symbol` (you must manually migrate or flush your cached instruments)
- Renamed `Position.cost_currency` to `settlement_currency` (standardize terminology)
- Renamed `CacheDatabaseConfig.flush` to `flush_on_start` (for clarity)
- Changed `Order.ts_last` to represent the UNIX nanoseconds timestamp of the last _event_ (rather than fill)

### Fixes
- Fixed `Portfolio.net_position` calculation to use `Decimal` rather than `float` to avoid rounding errors
- Fixed race condition on `OrderFactory` order identifiers generation
- Fixed dictionary representation of orders for `venue_order_id` (for three order types)
- Fixed `Currency` registration with core global map on creation
- Fixed serialization of `OrderInitialized.exec_algorithm_params` to spec (bytes rather than string)
- Fixed assignment of position IDs for contingency orders (when parent filled)
- Fixed `PENDING_CANCEL` -> `EXPIRED` as valid state transition (real world possibility)
- Fixed fill handling of `reduce_only` orders when partially filled
- Fixed Binance reconciliation which was requesting reports for the same symbol multiple times
- Fixed Binance Futures native symbol parsing (was actually Nautilus symbol values)
- Fixed Binance Futures `PositionStatusReport` parsing of position side
- Fixed Binance Futures `TradeReport` assignment of position ID (was hardcoded to hedging mode)
- Fixed Binance execution submitting of order lists
- Fixed Binance commission rates requests for `InstrumentProvider`
- Fixed Binance `TriggerType` parsing #1154, thanks for reporting @davidblom603
- Fixed Binance order parsing of invalid orders in execution reports #1157, thanks for reporting @graceyangfan
- Extended `BinanceOrderType` enum members to include undocumented `INSURANCE_FUND`, thanks for reporting @Tzumx
- Extended `BinanceSpotPermissions` enum members #1161, thanks for reporting @davidblom603