Log also the lang id model name that is involved in events

Possible values:
und_v0, und_v1

What is it:
The model version of the LangId model file.

Who determines this value?
The textclassifier team. The model version is burnt to the model file.

Test: m
Test: atest TextClassifierServiceTest

Bug: 152490822

Change-Id: I0058536ee4e5d8e9c14e100b61683c67af28981d