chore: remove web3 and add ethers packages

[infiniteflower]

This PR backports Android performance improvements from v10 to an upcoming v9.0.10.

This should not be merged into main as rc-v10 has already been merged. We will simply publish this branch.

Related: #293

[infiniteflower]

This is ready to be reviewed

[infiniteflower]

Conflicts with main don't matter as this was branched off of fcc2010 (9.0.9). The code diff is against 9.0.9.

[legobeat]

This should not be merged into main as rc-v10 has already been merged. We will simply publish this branch.

In order to keep things managable in event of future backports, I propose a long-living 9.x branch to publish from after merge into it. WDYT?

I just created a 9.x branch from 9.0.9 and changed the base on this PR to it. Then should also be mergable without conflicts.

[infiniteflower]

This should not be merged into main as rc-v10 has already been merged. We will simply publish this branch.

In order to keep things managable in event of future backports, I propose a long-living 9.x branch to publish from after merge into it. WDYT?

I just created a 9.x branch from 9.0.9 and changed the base on this PR to it. Then should also be mergable without conflicts.

Thanks @legobeat great idea! I'll merge into that branch then.