[Feature Request]: Add Client Notifications Support

[Hunter275]

Description

Originally reported at: meshtastic/web#431

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Description

The firmware is using client notifications for an increasing amount of validation of input values and rate limiting of packets.

Users need to be made aware that their actions have been ignored by the firmware.

[Hunter275]

Further reading: https://github.com/meshtastic/protobufs/blob/068646653e8375fc145988026ad242a3cf70f7ab/meshtastic/mesh.proto#L1725