[CK2/CM core] add logging to access and other functions

[gfursin]

We need to add logging of the main CK2/CM access function and other core functions.

Maybe we should add logging in these 2 places:

• https://github.com/mlcommons/ck/blob/master/ck2/cmind/core.py#L163 (to record i var)
• https://github.com/mlcommons/ck/blob/master/ck2/cmind/core.py#L477 (to record i and r)

@arjunsuresh - do you think you can check/prototype it based on your experience and needs? Thanks!