Digitomation

fix(common.opcua): Support LocalizedText Datatype

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## Summary This PR adds support for returning OPCUA LocalizedText values via the opc-ua input plugin. Prior to this PR, we silently drop those values. This PR is heavily inspired...

OPC UA doesn't support LocalizedText Datatype.

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### Use Case Having a OPC UA server where all strings are LocalizedText Values, Telegraf doens't log the text but only returns Quality Good. ### Expected behavior Expected would be...