fix: gas oracle from_gwei_f64()

[alstjd0921]

Motivation

I found a problem that the network does not include transactions that filled the gas cost related fields using the Mumbai gas station oracle.
The estimate_eip1559_fees() impl of the initial implementation output (1 gwei, 1 gwei). The value given by the gas station was actually (1.48666678666667gwei, 1.48666663666668gwei).
The proposed modification allows Oracle to simply convert the value given from the source to wei, raise the decimal point, and express it as a U256.

Frankly, I was not smart enough to fully understand how the u256_from_f64_saturating() function operates. However, I believe there is a definite issue with how the existing oracle function works, and the modified code has worked as intended.

Solution

PR Checklist

• Added Tests
• Added Documentation
• Breaking changes

[0xfourzerofour]

I am getting the same issue, did you figure out what was going on @alstjd0921

[alstjd0921]

I am getting the same issue, did you figure out what was going on @alstjd0921

change works well but I closed the pr because there was no review for a long time. I'll reopen it if necessary.