ApproxEqual for strings

[yevgenypats]

Describe the enhancement requested

In lot's of databases null characters (\x00) are not accepted in strings (For example postgres but not only). I think given it's such a common gotch in dbs this would be a great use-case for an arrayApproxEqualString method just like we have arrayApproxEqualFloat16.

Component(s)

Go

[singh1203]

@yevgenypats I would be delighted to help out here.

cc - @zeroshade @kou

[zeroshade]

Please do!