fix: log and round function planning with second argument as int64

[droidraja]

Closes cube-js/cube#8905

Add Int64 signatures for log and round function

[paveltiunov]

@droidraja Thanks for contributing! Could you please add test for that?

[droidraja]

@paveltiunov Since this is a addition of a UDF function signature for which there is no implementation, I need to test this with a logical plan generation alone, should I do this in this repository or in the main cube repo ? , please suggest.

[droidraja]

@paveltiunov Was able to find the right place in this repo itself to add appropriate testcases, please go ahead with the review