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perf: support string fields in column_scan test

This patch supports `string` fields in addition to `unsigned`. Column count
must equals 2 in that case: the first one (unsigned) is used as a primary
key, and the second one (string) is used for scan perf testing. The new
options `str_len_min` and `str_len_max` define the range of string lengths.
In case of arrow API, there are 2 testing modes:
 * notouch - strings are only scanned as a batch, without accessing them;
 * touch - strings are scanned + the first external character is checked.

Needed for tarantool/tarantool-ee#862

NO_DOC=perf test
NO_TEST=perf test
NO_CHANGELOG=perf test

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