Consider setting gas fee/limit

[lalexgap]

Right now I don't think we're setting a specific gas limit/fee and thus rely on a gas price oracle. This works great on testnets where no one really cares about the cost of the transaction.

However on mainnet we probably want to verify with the user how much is being spent on gas. If the network is busy a user might not be willing to pay the high gas fees to submit a transaction.

Metamask offers an example of how to handle this, it provides a recommended value but lets you adjust if it.

Another example of this is the rocketpool minipool CLI:

rocketpool node b

Your fee distributor's balance of 0.200140 ETH will be distributed as follows:
	Your withdrawal address will receive 0.071050 ETH.
	rETH pool stakers will receive 0.129090 ETH.

+============== Suggested Gas Prices ==============+
| Avg Wait Time |  Max Fee  |    Total Gas Cost    |
| 15 Seconds    | 38 gwei   | 0.0059 to 0.0089 ETH |
| 1 Minute      | 27 gwei   | 0.0042 to 0.0063 ETH |
| 3 Minutes     | 27 gwei   | 0.0042 to 0.0063 ETH |
| >10 Minutes   | 27 gwei   | 0.0042 to 0.0063 ETH |
+==================================================+

These prices include a maximum priority fee of 2.00 gwei.
Please enter your max fee (including the priority fee) or leave blank for the default of 27 gwei: