Rate command fails when the pair is within quotes

The rate command from CLI returns 'Rate is not available' if the pair is enclosed in quotes (single, or double). This is because the pair is captured literally as a string and passed to the show_rate. The fix proposed is to add an eval in the oracle_rate_msg since that is where the 'upper' is applied, i.e. formatting of the pair to meet the required format, but another solution can be investigated

https://github.com/hummingbot/hummingbot/pull/5458