GitLab

* [doc/example] init gemv doc and examples

* [example] add vectorized read

* [example] use local register instead of smem

* [example] add bench

* [doc] update doc

* [doc] refine doc

* [lint] format code

* [doc] add tips

* [doc/example] fix typo

* [example] use tmv_all_reduce

* [doc] update doc accordingly

* [doc] add benchmark table

* [lint] format code