feat: Narrow typechain SealedBool/Uint/Address utype

[architect-dev]

In hardhat typechain runs directly after a hardhat compile task is run. The types for SealedBool/SealedUint/SealedAddress generated by typechain look like this:

export type SealedUintStruct = { data: string; utype: BigNumberish };

export type SealedUintStructOutput = [data: string, utype: bigint] & {
  data: string;
  utype: bigint;
};

However fhenix.js expects the type of SealedUint to have utype to be constrained to the utypes associated with each Uint (0-5 for uint8-uint256). The narrowed utype field allows us to statically convert a SealedUint type into a bigint, and a SealedBool type into a bool. This allows fhenixsdk.unseal to accurately infer the unsealed return types of a sealed output function. Without the narrowed utype unseal does not correctly type the unsealed data. This PR performs a find and replace of the generated types and narrows them.

For example:

// Solidity

function getUserCounterPermitSealed(
    PermissionV2 memory permission
  ) public view withPermission(permission) returns (SealedUint memory)
  
// Counter.test.ts

const sealedCountedAmount = await counter.getUserCounterPermitSealed(args);
//          ?^ type: SealedUintStructOutput
const unsealedCountedAmount = await fhenixsdk.unseal(sealedCountedAmount);
//          ?^ type: bigint

All instances of SealedUintStruct and SealedUintStructOutput (generated in typechains configured outDir) with the narrowed versions (utype: bigint -> utype: 0 | 1 | 2 ...). This replacement step is already done in the frontend by overriding abitype and viem, and this PR adds the functionality to the hardhat side.

NOTE: This is a pretty quick and dirty way of making this replacement, the alternatives are typescript interface declaration merging (wont work since the literals would be unioned with the existing type: 0 | 1 ... | 5 | bigint), or creating a custom typechain target which changes the internals of how the types are generated (time consuming and vendor locking).

Screenshot of usage (from fhenix-hardhat-example)