[RFC] TensorIR: A schedulable IR for TVM

[spectrometerHBH]

@ds1231h

However, will this increase the coupling between the schedule and the lower pass, which may lead to an increase in the complexity of the lower pass?

Thanks for your reply! @ds1231h

At the moment, we at first transform TIR with block to TIR without block in one pass(the latter is current TIR in the main repo) and utilizes the current TIR lowering passes to do codegen. And we can gradually refactor this lowering process in the future.