Spec: deprecate distinct_counts in data_file

[gtrettenero]

Deprecating 111 distinct_counts, which was removed a long time ago

[ajantha-bhat]

LGTM. Thanks for finding this out and fixing it.

PR title can be
"Spec: deprecate distint_counts in data_file"

[gtrettenero]

Thanks for the LGTM, I cannot merge since I don't have write access, would you merge it please?

[ajantha-bhat]

cc: @Fokko, @nastra

[nastra]

I think we can just remove it from the spec, no need to deprecate it, because deprecating would mean that there's still code that reads this field

[ajantha-bhat]

Long back while removing some fields from code, we just deprecated in the spec.
#914

So, I suggested a similar approach for this instead of removing.

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