msgbus cleanup: remove whoami api method (#6053)

Remove old whoami method used by `ydbd whoami` cli command but
wrapped in msgbus stuff. 

Also, in order to remove (some of that) msgbus wrappers we want `ydbd` to
reuse pure grpc implementations of cli commands from `ydb`.
But `ydb/public/lib/ydb_cli/commands` library as a whole
has link dependencies (transitive from the workload commands)
that are incompatible with the dependencies of `ydbd`.
The minimal required portion was isolated from the library
to be shared between both the library/`ydb` and `ydbd`.

KIKIMR-21500

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