fix: returned string of BigInt.toHexString

[fewwwww]

For The Graph's graph-ts implementation, BigInt.toHex() and BigInt.toHexString() behaves the same.

toHex(): string {
  return typeConversion.bigIntToHex(this);
}

toHexString(): string {
  return typeConversion.bigIntToHex(this);
}

However, in my thoughts toHex() should return a string that looks like deadbeef while toHexString() should return a string that looks like 0xdeadbeef.

So the implementation should be updated into:

toHex(): string {
  return typeConversion.bigIntToHex(this);
}

toHexString(): string {
  return "0x" + typeConversion.bigIntToHex(this);
}

Additionally, toHexString() is not tracked by The Graph's AssemblyScript API docs.

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Latest commit: 890385bfd4ce2e941463d3aa9e409cf9f0741a3b

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