crud: refactor optional types to use go-option#498

oleg-jukovec merged 2 commits intomastertarantool/go-tarantool:masterfrom

babyTsakhes/gh-492-replace-usage-of-optional-types-in-crud-with-go-optiontarantool/go-tarantool:babyTsakhes/gh-492-replace-usage-of-optional-types-in-crud-with-go-optionCopy head branch name to clipboard