the first version of high-level-pull-consumer

[shendongsd]

What is the purpose of the change

#738

Brief changelog

the first version of high-level-pull-consumer ，and some functions are not implemented

Verifying this change

XXXX

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[francisoliverlee]

fail to run example for examples/consumer/highlevelpull/main.go

update like bellow would be OK.

[shendongsd]

fail to run example for examples/consumer/highlevelpull/main.go

update like bellow would be OK.

I have fixed this.

[francisoliverlee]

fail to run example for examples/consumer/highlevelpull/main.go update like bellow would be OK.

I have fixed this.

nice!