Feat/prefix pkp with hex

[Ansonhkg]

Description

When creating session sigs, user will need to prefix their pkp public key with hex when , and if they don't, they will run into invalid arrayify value while using bytes32 array when trying to sign. We should really just prefix it for them if it's not.

  const sessionSigs = await litNodeClient.getSessionSigs({
    pkpPublicKey: `0x${pkpPublicKey}`;
    expiration: expiration,
    chain: 'ethereum',
    resourceAbilityRequests: [
      {
        resource: new LitPKPResource('*'),
        ability: LitAbility.PKPSigning,
      },
    ],

Type of change

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update