Enhancement: Calc and show base fee and overage from chain-defined floor gas price

[minxylynx]

Summary

Currently, explorer is calcing a market rate for a validator based on the submitted fees and gas_wanted value. We should also calc the base fee and overage values given the network's floor gas price.

Proposal

• Taking the fees that are already ingested, add the base + overage, and recalc from gas used * floor gas price to get the network base/overage values.
• Return as network fees breakdown

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