[FL-3669] Expansion module protocol (#3250)

* ApiSymbols: add furi_record_destroy
* FuriHal: cleanup serial API, add logging configuration in RTC
* FuriHal: hide private part in _i header. Toolbox: cleanup value index. SystemSettings: logging device and baudrate.
* FuriHal: RTC logging method documentation
* Synchronize API Symbols
* Furi: mark HEAP_PRINT_DEBUG as broken
* FuriHal: furi_hal_serial, add custom IRQ func
* Fix PR review issues
* Implement basic external module detection and echo
* Update api symbols for f18
* Minimally working implementation (can create directory via rpc)
* Make expansion protocol parser a header-only library
* Rename a function
* Improve thread syncronisation
* Implement multi-packet transmissions
* Improve test application
* Clean up expansion worker code
* Send heartbeat when host is ready
* Update API symbols
* Add draft documentation
* Expansion worker: proper timeout and error handling
* Expansion worker: correct TX, do not disable expansion callback
* Expansion protocol: pc side test script
* PC side expansion test: trying to change baudrate
* Working comms between 2 flippers
* Cleaner exit from expansion worker thread
* Better checks
* Add debug logs
* Remove unneeded delays
* Use USART as default expansion port
* Refactor furi_hal_serial_control, fix crash
* Improve furi_hal abstraction, wait for stable rx pin
* Remove rogue include
* Set proper exit reason on RPC error
* Remove rogue comment
* Remove RX stability check as potentially problematic
* Improve expansion_test application
* Remove rogue define
* Give up on TODO
* Implement expansion protocol checksum support
* Update ExpansionModules.md
* RPC: reverse input
* Assets: sync protobuf
* Fix typos
* FuriHal: UART add reception DMA (#3220)
* FuriHal: add DMA serial rx mode
* usb_uart_bridge: switch to working with DMA
* Sync api symbol versions
* FuriHal: update serial docs and api
* FuriHal: Selial added similar API for simple reception mode as with DMA
* FuriHal: Update API target H18
* API: ver API H7
* FuriHal: Serial error processing
* FuriHal: fix furi_hal_serial set baudrate
* Sync api symbols
* FuriHal: cleanup serial isr and various flag handling procedures
* FuriHal: cleanup and simplify serial API
* Debug: update UART Echo serial related flags
* FuriHal: update serial API symbols naming
* Make expansion_test compile
* Remove unneeded file
* Make PVS-studio happy
* Optimise stack usage
* Optimise heap usage, improve api signature
* Fix typo
* Clean up code
* Update expansion_protocol.h
* Fix unit tests
* Add doxygen comments to expansion.h
* Update/add doxygen comments
* Update ExpansionModules.md
* Github: new global code owner
* FuriHal: naming in serial control
* Expansion: check mutex acquire return result

Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>
Co-authored-by: hedger <hedger@users.noreply.github.com>
Co-authored-by: SkorP <skorpionm@yandex.ru>
Co-authored-by: SG <who.just.the.doctor@gmail.com>
Co-authored-by: Skorpionm <85568270+Skorpionm@users.noreply.github.com>

targets/f7/furi_hal/furi_hal_serial.h

@@ -48,6 +48,15 @@ void furi_hal_serial_suspend(FuriHalSerialHandle* handle);
  */
 void furi_hal_serial_resume(FuriHalSerialHandle* handle);
 
+/**
+ * @brief Determine whether a certain baud rate is supported
+ *
+ * @param      handle  Serial handle
+ * @param      baud baud rate to be checked
+ * @returns    true if baud rate is supported, false otherwise.
+ */
+bool furi_hal_serial_is_baud_rate_supported(FuriHalSerialHandle* handle, uint32_t baud);
+
 /** Changes baud rate
  *
  * @param      handle  Serial handle
@@ -152,6 +161,42 @@ typedef void (*FuriHalSerialDmaRxCallback)(
     size_t data_len,
     void* context);
 
+/**
+ * @brief Enable an input/output directon
+ *
+ * Takes over the respective pin by reconfiguring it to
+ * the appropriate alternative function.
+ *
+ * @param     handle        Serial handle
+ * @param     direction     Direction to enable
+ */
+void furi_hal_serial_enable_direction(
+    FuriHalSerialHandle* handle,
+    FuriHalSerialDirection direction);
+
+/**
+ * @brief Disable an input/output directon
+ *
+ * Releases the respective pin by reconfiguring it to
+ * initial state, making possible its use for other purposes.
+ *
+ * @param     handle        Serial handle
+ * @param     direction     Direction to disable
+ */
+void furi_hal_serial_disable_direction(
+    FuriHalSerialHandle* handle,
+    FuriHalSerialDirection direction);
+
+/**
+ * @brief Get the GPIO pin associated with a serial
+ *
+ * @param     handle        Serial handle
+ * @param     direction     Direction to query
+ * @returns   pointer to the respective pin instance
+ */
+const GpioPin*
+    furi_hal_serial_get_gpio_pin(FuriHalSerialHandle* handle, FuriHalSerialDirection direction);
+
 /** Start and sets Serial event callback receive DMA
  *
  * @param      handle         Serial handle