fix: add workaround that intToHex produce valid Quantity format

[YuyaMaruyama21D4E]

Hi and thank you for maintaining this library!
I would like to fix an issue where event hooks are not working in MetaMask.

Specification

• geth and the spec no longer support leading zero
• Reference:
  • Integer values and leading zeros ethereum/execution-apis#40 (comment)
  • Accept leading zeros in QUANTITY NomicFoundation/hardhat#1585 (comment)

Issue Description

• Events emitted by the contract aren't being received when subscribing with .contract.on("EventName", callback)
• Event hooks occasionally fail to arrive
• This issue is specific to MetaMask (works fine with other wallets)
• Many dApps are affected by MetaMask's subscription functionality issues
• Related issues:
  • intToHex util produces invalid Quantities #70
  • Why do we pad uneven length hex numbers with leading zeros? #152
  • eth_getLogs: invalid argument 0: hex number with leading zero digits metamask-extension#8220

Proposed Solution

• This PR is intended as a temporary workaround until the intToHex function in hexUtils.js is properly audited
  • Reference for auditing function:
    • fix: make intToHex produce valid Quantity #71 (comment)
• Added local intToHex implementation to log-filter.js
  • Following the same approach already used in getBlocksForRange.js