refac: fix row and k like members to 32bit

[chokobole]

Description

This PR fixes the type of Row, K like members to 32 bit. The reason why the index of the row is changed to 32 bit is because it is used as an exponent of the roots of unity.

[fakedev9999]

@chokobole Please fix commit message of 7c0c84e from "K-like" to "K-like members".

[fakedev9999]

@chokobole Please fix commit message of 101729e from "refac(zk): use unused header" to "refac(zk): remove unused header".