Arduino Wire.h I2C custom transport on Pi Pico is causing a crash

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- Hardware description: Pi Pico
- RTOS: I think arduino mbed
- Version or commit hash: humble

#### Steps to reproduce the issue
I'm trying to make a custom transport for I2C using arduino's Wire library. I am able to build and flash the microros_publisher example, everything works over serial and I can see the topic and node in a docker container. However, when I replace setting the serial transport with my own, I think the pico crashes since i'm getting a flashing pattern on the pico (4 long, 4 0r 5 long). I really hope I'm missing something subtle. Also I'm not sure how I am supposed to properly use `uxr_init_custom_transport`, or if I'm supposed to use it at all, because the default serial transport doesn't. Also if this isn't the correct place to post this issue, please point me in the right direction.

here's my ini

```
env:pico]
platform = https://github.com/maxgerhardt/platform-raspberrypi.git
board = pico
framework = arduino
lib_deps =
https://github.com/micro-ROS/micro_ros_platformio

upload_protocol = mbed

board_microros_distro = humble
board_microros_transport = custom
```

heres the code

https://pastebin.com/5hzPiRcD

Commencez par l’ini de PlatformIO et le code Pastebin lié, en vous concentrant sur la configuration du transport personnalisé et sur l’endroit où `uxr_init_custom_transport` est utilisé. Reproduisez d’abord la référence série, puis le transport I2C sur le Pi Pico ; le travail est terminé lorsque le transport personnalisé ne fait plus planter la carte et que le nœud et le topic micro-ROS restent visibles.

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