feat: add read contract check on session signer

[Ang-dot]

• Happy Path:

  Connected to ACP: {
    agentWalletAddress: '0x2239461D0e0BE221397221b44fe0422Fcf480ddc',
    whitelistedWalletAddress: '0x2C976d905526523758C5C86166a1f9c3f3073E86',
    entityId: 1
  }
  Joined ACP Room
  

• Valid entity id but wrong whitelisted pk:

        throw new AcpError(
              ^
  AcpError: ACP Contract Client validation failed:
  {
    "agentWalletAddress": "0x2239461D0e0BE221397221b44fe0422Fcf480ddc",
    "entityId": 2,
    "givenSessionSignerAddress": "0x2C976d905526523758C5C86166a1f9c3f3073E86",
    "expectedSignerAddress": "0x0Ce7D2950178C6F1c500e6836AC11DF4a2eC4071"
  }
      at AcpContractClientV2.<anonymous> (/Users/yang/Desktop/acp-node/src/contractClients/acpContractClientV2.ts:164:13)
      at Generator.next (<anonymous>)
      at fulfilled (/Users/yang/Desktop/acp-node/src/contractClients/acpContractClientV2.ts:5:58)
      at processTicksAndRejections (node:internal/process/task_queues:105:5)
  

• Invalid entity id:

        throw new AcpError(
              ^
  AcpError: ACP Contract Client validation failed:
  {
    "reason": "no whitelisted wallet registered on-chain for entity id",
    "entityId": 9,
    "agentWalletAddress": "0x2239461D0e0BE221397221b44fe0422Fcf480ddc"
  }
      at AcpContractClientV2.<anonymous> (/Users/yang/Desktop/acp-node/src/contractClients/acpContractClientV2.ts:150:13)
      at Generator.next (<anonymous>)
      at fulfilled (/Users/yang/Desktop/acp-node/src/contractClients/acpContractClientV2.ts:5:58)
      at processTicksAndRejections (node:internal/process/task_queues:105:5)
  

• Invalid agent wallet address:

        throw new AcpError(
              ^
  AcpError: ACP Contract Client validation failed: agent account 0x2239461D0e0BE221397221b44fe0422Fcf480dda is not deployed on-chain
      at AcpContractClientV2.<anonymous> (/Users/yang/Desktop/acp-node/src/contractClients/acpContractClientV2.ts:124:13)
      at Generator.next (<anonymous>)
      at fulfilled (/Users/yang/Desktop/acp-node/src/contractClients/acpContractClientV2.ts:5:58)
      at processTicksAndRejections (node:internal/process/task_queues:105:5)