[Community] Ruihang Lai -> PMC (#16165)

Sorry for the late update, but please join me in welcoming Ruihang Lai
as a new PMC member of Apache TVM.

Ruihang has been an invaluable contributor to our community since 2020
and became a committer in 2022. He has consistently demonstrated his
dedication and expertise in various aspects. He has led the design of
TensorIR and MetaSchedule, and has been actively contributing to areas
including arithmetic analysis, and performance on Apple M1 and iOS
devices. Besides, he is actively engaged with the community in the
discuss forum. This year, he also contributed a talk and a tutorial
session in TVMCon. He is also the co-author of [SparseTIR](https://arxiv.org/abs/2207.04606) paper,
reflecting his expertise in machine learning compilation and the
research interests that align with the vision of TVM.

- [Commit history](https://github.com/apache/tvm/commits?author=MasterJH5574)
- [Code Review] (https://github.com/apache/tvm/pulls?utf8=%E2%9C%93&q=reviewed-by:MasterJH5574)
- [Community Forum Summary] (https://discuss.tvm.apache.org/u/MasterJH5574/summary)

CONTRIBUTORS.md

@@ -52,7 +52,7 @@ We do encourage everyone to work anything they are interested in.
 - [Elen Kalda](https://github.com/ekalda): @ekalda - ethos-u, arm
 - [Marisa Kirisame](https://github.com/MarisaKirisame): @MarisaKirisame - relay
 - [Tristan Konolige](https://github.com/tkonolige): @tkonolige - profiling, relay, tir, runtime
-- [Ruihang Lai](https://github.com/MasterJH5574): @MasterJH5574 - tir, tvm-script
+- [Ruihang Lai](https://github.com/MasterJH5574) (PMC): @MasterJH5574 - tir, tvm-script
 - [Wuwei Lin](https://github.com/vinx13) (PMC): @vinx13 - relay, topi, tir, meta_schedule
 - [Yizhi Liu](https://github.com/yzhliu) (PMC): @yzhliu - jvm, topi, relay
 - [Hao Lu](https://github.com/hlu1): @hlu1 - nnpack, frontends