chore: change Gateway contract to be upgradable

[skosito]

Using openzeppelin hardhat upgrades, and UUPS proxy.

Resources: https://docs.openzeppelin.com/upgrades-plugins/1.x/writing-upgradeable

UUPS vs Transparent Proxy: https://docs.openzeppelin.com/contracts/4.x/api/proxy#transparent-vs-uups

Had to go with lower package versions because ethers 5 is used. We should consider bumping ethers and other packages.

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[skosito]

Even though we have the OZ docs, I think it would be great to add a test to show how the upgrade process would look like

added this

one more thing in upgrade process on real networks would be to track network files in source control https://docs.openzeppelin.com/upgrades-plugins/1.x/network-files

where things like storage layout, implementation contracts address etc would be stored, so when there is upgrade, plugin would validate that storage layout is not broken etc.

but i guess we can discuss that once we move from PoC to livenet deployments

[lumtis]

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