fix(base): clean misleading validation messages and contract call naming

[alejandroGM0]

Summary

This PR cleans up misleading validation messages and confusing naming in the base module.

Changes

• fixed incorrect null-check messages for accountId in:
  • AccountClient
  • Account
  • AccountBalanceRequest
  • MirrorNodeClient
• fixed incorrect null-check messages in:
  • TransactionRepository (result instead of type)
  • AccountCreateResult (newAccount instead of newAccountId)
  • SmartContractClientImpl (protocolLayerClient instead of protocolLevelClient)
  • FileClientImpl (protocolLayerClient instead of protocolLevelClient)
  • ReceiveRecordInterceptor (function instead of handler)
• clarified ReceiveRecordInterceptor docs so handler and function are described consistently
• renamed ContractCallRequest parameter naming from constructorParams to functionParams
• fixed invalid validation text in ContractCallRequest
  • maxTransactionFee must be at >= null -> maxTransactionFee must be non-negative
  • transactionValidDuration must be at >= zero -> transactionValidDuration must be positive
• updated ProtocolLayerClientImpl to use request.functionParams() for contract call execution

Verification

Passed focused tests:

• ProtocolLayerDataCreationTests
• AccountClientImplTest