Torts — Legal malpractice — Insurance carrier — Privity — Law firm hired by insurer to defend insured against liability claims — Insurer lacked standing to sue law firm where nothing in evidence indicates that law firm was in privity with insurer or that insurer was an intended third-party beneficiary — Public policy does not dictate that an insurer should be able to pursue legal malpractice claims against defense counsel it retains to represent its insureds and the court is unwilling to expand field of privity exceptions