Migrate `cbuilder` module and adapt it

[ochaplashkin]

The original cbuilder module (tarantool/test/config-luatest/cbuilder.lua) has been moved to the current project with minor changes and will be available as follows:

    local t = require('luatest')
    t.cbuilder:new(...)

The helper requires Tarantool 3.0.0 and newer. Otherwise Builder:new() will cause an error.