Upgrading to OpenZeppelin v5 and Solidity 0.8.20

[minghinmatthewlam]

Why this should be merged

Fixes #188

How this works

• Adds OZ contracts and contracts-upgradeable to lib instead of pointing the remapping to teleporter's lib
• SafeERC20.forceApprove instead of safeApprove
• OZ v5 removes IERC20Upgradeable and instead upgradeable ERC20s still implement IERC20
• WrappedNativeToken does not need to be upgradeable.
• When the internal _spendAllowance is called, previous OZ v4 would emit Approval, but in v5 by default it will not emit the event, so removed that emit from unit tests.
• _burn is moved above _handleFees for token remotes, comparable to how token home contracts deposit then handle fees
• Unit tests account for OZ v5 custom errors
• updates to corresponding teleporter upgraded versions commit

How this was tested

CI

How is this documented

update comments/readme

[iansuvak]

LGTM other than the typo, but looks like the e2e tests are still failing

[bernard-avalabs]

Generally makes sense to me. Just pointed a comment that might need to be updated.