perf: avoid initializing ethers contracts during construction

[DanielSchiavini]

• Fixes performance issue
  • When we open curve-frontend, all Pool objects are created
  • In the constructor, some other ethers contracts are initialized by calling curve.contracts[...].contract
  • We initialize many pools, each pool has many methods
  • When we call ethers new Contract, the function defineProperties takes ~50% of the render time in the swap page
  • By avoiding the ethers initialization, we can save a lot of CPU time
• Introduced abitype for better type checking
  • Update to typescript 5 was necessary
  • Updated other dependencies for good practice
• Replaced contract parsing with abi checking in
  • the poolConstructor - this is called from the swap page
  • the rewardsOnly method - this is called from the pools page

[DanielSchiavini]

Notice how the defineProperties takes a lot of CPU time (40% in this case) because it repeats a lot!

[DanielSchiavini]

Now after my changes, the bottleneck is gone

[DanielSchiavini]

Rebased in #390 due to unsigned commits in the merge