Keep sum stat for string when min/max stat is too long in ORC writer

[islamismailov]

== RELEASE NOTES ==

General Changes
* Output (sum) string stat even if min/max values are too long. This is needed for the read-path to be able to better estimate the size of row.

[islamismailov]

Might need to fully revert this diff, since we do not need to drop min/max to avoid OOMing the verifier anymore:

ea23a90

[wenleix]

LGTM.

For the commit message, I would suggest

Keep sum stat for string when min/max stat is too long in ORC writer 

[islamismailov]

Only those with write access to this repository can merge pull requests.

• Can please somebody with write access merge this whenever possible?

[highker]

Assign to @wenleix to merge

[wenleix]

Merged #13879. Thanks @islamismailov for the contribution!