[LTC] Adopt even more LazyTensor interfaces (#4317)
Summary:
This patch adopts even more LazyTensor interfaces:
1. Reuse TryLimitGraphSize and CreateTensorNode directly.
2. Override size, ToTensor, dtype, ApplyPendingGraph, AssignIrValue, and GetIrValueForTensor.
It depends on pytorch/pytorch#90686.
Test Plan:
CI.
