[COMMUNITY] Mehrdad Hessar -> Committer (#10901)

Please join us to welcome @mehrdadh as a new committer to TVM.

Mehrdad has greatly contributed to the Hexagon backend, tvmc bug fixes as well as microTVM implementation. He has been also very active in the PR reviews, community meetings and forum discussion to share his ideas.

- [Commits History](https://github.com/apache/tvm/commits?author=mehrdadh)
- [Code Review](https://github.com/apache/tvm/pulls?utf8=%E2%9C%93&q=reviewed-by:mehrdadh)
- [Community Forum Summary](https://discuss.tvm.apache.org/u/mehrdadh/summary)

CONTRIBUTORS.md

@@ -37,6 +37,7 @@ We do encourage everyone to work anything they are interested in.
 - [Zhi Chen](https://github.com/zhiics) (PMC): @zhiics - relay, quantization, pass manager
 - [Siyuan Feng](https://github.com/Hzfengsy) (PMC): @Hzfengsy - tir
 - [Josh Fromm](https://github.com/jwfromm): @jwfromm - frontends, quantization, topi
+- [Mehrdad Hessar](https://github.com/mehrdadh): @mehrdadh - microTVM, hexagon
 - [Bohan Hou](https://github.com/spectrometerHBH): @spectrometerHBH - tir, arith, tvm-script
 - [Yuwei Hu](https://github.com/Huyuwei): @Huyuwei - topi, frontends
 - [Nick Hynes](https://github.com/nhynes): @nhynes: - sgx, rust