feat: add OP Stack address alias utilities

[dieutx]

Summary

• add applyL1ToL2Alias, undoL1ToL2Alias, and L1_TO_L2_ALIAS_OFFSET utility exports
• expose the new alias helpers from both the root package entrypoint and op-viem/utils
• add regression tests that compare the implementation against @eth-optimism/core-utils

Problem

Issue #117 asks for helpers that compute the aliased L2 msg.sender for L1 contract callers.

Today op-viem mentions address aliasing in deposit docs and runtime errors, but it does not provide a first-class helper for users who want to predict or reverse the aliased address.

Solution

This PR adds utility functions that mirror the OP Stack aliasing scheme:

• applyL1ToL2Alias(address)
• undoL1ToL2Alias(address)
• L1_TO_L2_ALIAS_OFFSET

The implementation follows the same offset-based scheme used in the OP Stack reference utilities and validates addresses before transforming them.

Verification

• ./node_modules/.bin/vitest run src/utils/addressAlias.test.ts
• ./node_modules/.bin/dprint fmt src/utils/addressAlias.ts src/utils/addressAlias.test.ts src/utils/index.ts src/index.ts
• ./node_modules/.bin/biome check src/utils/addressAlias.ts src/utils/addressAlias.test.ts src/utils/index.ts src/index.ts

Closes #117