Get gas right on polygon and reenable

[wildmolasses]

Let's see what conclusion results from sdk suggestions. If gas estimation is no longer a prereq, then great; otherwise we can use something like polygon gas station to calculate gas.

c.f. @mds1 element chat:

https://github.com/ethers-io/ethers.js/blob/bf0b468490cb293cd916e4fff06e0909273719e6/packages/abstract-provider/src.ts/index.ts#L252
so yea, 1.5gwei is just hardcoded by ethers
but we can just copy their logic

maxPriorityFeePerGas = BigNumber.from(30 gwei);
maxFeePerGas = block.baseFeePerGas.mul(2).add(maxPriorityFeePerGas);

related open issue: ethers-io/ethers.js#3370
another one ethers-io/ethers.js#2828
seems people use https://wiki.polygon.technology/docs/develop/tools/polygon-gas-station/ manually for polygon
nice looking implementation here: ethers-io/ethers.js#2828 (comment)
good explanation from ricmoo here: ethers-io/ethers.js#2828 (comment)