* Adds HardwareSerial::setTxBufferSize()

* uartBegin def fix

* checks TXBufferSize  as defined in IDF

Makes sure that the buffer size will not cause a reset to the board.

* Removes double value in Rx/Tx Buffer Size 

Keeps Rx/Tx buffer size as set, not doubling it. It makes the process more clear.
Co-authored-by: NRodrigo Garcia <rodrigo.garcia@espressif.com>

* Adds C++ std::function to Serial.onReceive()

* fixes LOCK macro when disabled

* fixes setPins and begin to keep rx/tx unmodified

* adds Hardware Flow Control mode and CTS/RTS pin setting

* adds Hardware Flow Control mode and CTS/RTS pin setting

* adds Hardware Flow Control mode and CTS/RTS pin setting

* adds Hardware Flow Control mode and CTS/RTS pin setting

* Code Review

* Adds UART RX IRQ Callback with onReceive()

* Add support for the hardware CDC in ESP32-C3

* Adds rxBufferSize parameter to begin()

* Adds HardwareSerial::setRXBufferSize()

## Summary
This PR is a complete reffactoring of UART Serial Hardware and respective HAL in order to use IDF instead of current Register manipulation approach. 

It  implements Arduino SerialEvent functionality. 

Fix #5287  
Fix #5273 
Fix #5519 
Fix #5247 
Fix #5403
Fix #5429
Fix #5047
Fix #5463
Fix #5362 
Fix #5112  
Fix #5443 

## Impact
It solves many reported issues related to UART.
It was tested and works fine for ESP32, ESP-S2 and ESP32-C3.

* Add initial support for USB MSC

* Add Firmware Upload/Download With MSC

Current running firmware is available as file inside the MSC Disk. To update the firmware on the ESP, just copy a regular firmware bin into the drive

* Support overwriting of the firmware file

Overwriting a file is done totally differently on MacOS, Windows and Linux. This change supports it on all of them.

* Allow CDC, FirmwareMSC and DFU to be enabled on boot

* Add example ESP32-S2 USB-ONLY board

* Various device code optimizations

Added `end()` methods to MSC classes
Made begin() methods safe to be called multiple times
Optimized CDC class

* Fix CDC Connect/Disconnect detection in Arduino IDE on Windows

* Rework cdc_write

* Update ESP32-S2 board configs

Fixes: https://github.com/espressif/arduino-esp32/issues/5005

This is very much still work in progress and much more will change before the final 2.0.0

Some APIs have changed. New libraries have been added. LittleFS included.
Co-authored-by: NSeon Rozenblum <seonr@3sprockets.com>
Co-authored-by: NMe No Dev <me-no-dev@users.noreply.github.com>
Co-authored-by: Ngeeksville <kevinh@geeksville.com>
Co-authored-by: NMike Dunston <m_dunston@comcast.net>
Co-authored-by: NUnexpected Maker <seon@unexpectedmaker.com>
Co-authored-by: NSeon Rozenblum <seonr@3sprockets.com>
Co-authored-by: NmicroDev <70126934+microDev1@users.noreply.github.com>
Co-authored-by: Ntobozo <tobozo@users.noreply.github.com>
Co-authored-by: Nbobobo1618 <bobobo1618@users.noreply.github.com>
Co-authored-by: Nlorol <lorolouis@gmail.com>
Co-authored-by: Ngeeksville <kevinh@geeksville.com>
Co-authored-by: NLimor "Ladyada" Fried <limor@ladyada.net>
Co-authored-by: NSweety <switi.mhaiske@espressif.com>
Co-authored-by: NLoick MAHIEUX <loick111@gmail.com>
Co-authored-by: NLarry Bernstone <lbernstone@gmail.com>
Co-authored-by: NValerii Koval <valeros@users.noreply.github.com>
Co-authored-by: N快乐的我531 <2302004040@qq.com>
Co-authored-by: Nchegewara <imperiaonline4@gmail.com>
Co-authored-by: NClemens Kirchgatterer <clemens@1541.org>
Co-authored-by: NAron Rubin <aronrubin@gmail.com>
Co-authored-by: NPete Lewis <601236+lewispg228@users.noreply.github.com>

* Fixes UART detach.  Fixes #3878

* 0 is not a good holder value for pins!

* 0 is not a good holder value for pins!

* API compatibility to AVR, ESP8266, et al

* Add non-blocking HardwareSerial::read(buffer, size) extension (ESP8266 portability)

* Refactor for fewer indirect calls.

* add option to Flush() to only clear txQueue

Add the option to cause Flush() to just wait for tx data to clear the tx fifo and uart, leave the rx queue and rx fifo as is.

* support tx only flush()

* support tx only Flush()

* support txOnly for Flush()

* compatibility to Stream()

* compatibility for Stream()

* default value error

* default value error

* Update esp32-hal-uart.h

* Update esp32-hal-uart.c

* Update HardwareSerial.cpp

* sp

* correctly implement flushTxOnly()

* Add updateBaudRate to hardware serial

* remove flush

* Fix tab

* Added baudrate detection to esp32-hal-uart and HardwareSerial

* Solved compiler warning for uartResizeRxBuffer()

* Add unit to header variable name (timeout_ms)

* Reverting accidentally changed files to master

* Add small delay after baudrate detection

Add functionality allowing rxBuffer of HardwareSerial to be changed in size via HardwareSerial::setRxBufferSize. (#1855)

* HardwareSerial - availableForWrite() support

* fix indentation errors (tab vs space)

Added argument to HardwareSerial.begin to specify whether the logic levels of the UART rx and tx lines should be inverted (#719)

usefull for ESP8266 compatibility

fixes: https://github.com/espressif/arduino-esp32/issues/55

many possible problems fixed in preparation for thread-safe