Support writing to custom attributes in dev console

[krzysztof-kwitt]

Is your feature request related to a problem? Please describe.

I used Xiaomi LYWSD03MMC with custom firmware - pvvx/ZigbeeTLc To calibrate the temperature or humidity in this device, you must save a custom attribute as described in this ticket: https://github.com/pvvx/ZigbeeTLc/issues/30 Unfortunately, this is not possible because Z2M only allows writing to attributes previously defined by the library.

PS. This can be done in ZHA.

Describe the solution you'd like I would like it to be possible, in addition to selecting from the list, to enter the ID of the attribute from which we want to read or write values.

Describe alternatives you've considered

I have currently added exposes for this device in PR: https://github.com/Koenkk/zigbee-herdsman-converters/pull/6939, but this lack made it difficult for me to test whether everything was working properly.

Additional context N/A

[gacopl]

was surprised also by this, was expecting dev console will allow me to write to any clusterid and attribute as long as the device responds, unfortunately it will fail if its not defined in converter