TCC: protect dictionaries from changing while accessed.threaded-core-commands

Certain Redis objects may change upon read only access. This is the
case, for instance, of hash tables, that may continue to incrementally
rehash after a rehashing operation. A similar problem also happens with
the PFCOUNT operation and other operations that may write as a side
effect of reading. In the case of PFCOUNT probably the right approach
would be to flag the command in a special way in the command table, so
that the operation is blocked as it if was a write operation.

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