Allows changing HW CDC Buffer Size after or before begin()

[SuGlider]

Description of Change

This PR fixes HW CDC for the C3 and S3 in order to keep the buffer size already set after calling HWCDC::begin(). In case no size was set before HWCDC:begin(), it will use a default RX/TX buffer size of 256 bytes.
HWCDC::setTxBufferSize() and HWCDC::setRxBufferSize() will set the buffer size if called at any time and it won't change until a new call to this function.
HWCDC:begin() will only set a default buffer size if none has been set already. If HWCDC::setTxBufferSize() and/or HWCDC::setRxBufferSize() was called before, it won't change the buffer size as set by the user. If those functions are called after HWCDC::begin() a new buffer will be allocated with the proper new size.

Therefore, the RX/TX buffer size can be set at any time, after or before HWCDC::begin() is called, even more than one time, in any order.
Previous memory will be released and a new buffer is allocated.

Tests scenarios

Tested with the ESP32-C3 and ESP32-S3 using HW Serial (HW USB CDC).

Sending 100, 200, 400, 500 and 1000 bytes using the Arduino IDE Serial Monitor.

void setup() {
  Serial.begin(115200);
  Serial.setRxBufferSize(1024);
  Serial.setTxBufferSize(1024);
  Serial.begin(115200);
}

#define MAX_INPUT_BUFFER_SIZE 4096

uint32_t inputBufferPos = 0;
uint8_t inputBuffer[MAX_INPUT_BUFFER_SIZE + 1];

void loop() {
  uint32_t readInLoopCount = 0;
  while (Serial.available()) {
    uint8_t readByte = Serial.read();
    inputBuffer[inputBufferPos] = readByte;
    inputBufferPos += 1;
    readInLoopCount += 1;

    if (readByte == '\n') {
      inputBuffer[inputBufferPos] = 0;
      // Serial.print((char*)inputBuffer);
      Serial.printf("GOT: %d\n", strlen((char*)inputBuffer));
      inputBufferPos = 0;
    }
    if (inputBufferPos >= MAX_INPUT_BUFFER_SIZE) {
      Serial.println("ERR INPUT TOO LONG");
      inputBufferPos = 0;
    }
  }

  if (readInLoopCount > 0) {
    Serial.printf("GOT IN LOOP: %d\n", readInLoopCount);
  }
}

Related links

Closes #8522
Related to #8528