⚡[FEAT] Make mempool fee estimation visible

[whoabuddy]

Is your feature request related to a problem? Please describe.

When submitting transactions it's hard to know what to set the fee to, especially if there's a giant NFT drop right before you get started.

Describe the solution you'd like

There are two functions for getMempoolFeeAvg and getMempoolFeeMedian, but they only run when someone submits a mining tx and only output to console.

These values should be loaded on any page where tx submissions happen, and displayed in a consistent format.

[whoabuddy]

Also show the number of txs in the mempool?