Adding @sohami to OpenSearch maintainers (opensearch-project#8828)

I have nominated and maintainers have agreed to invite Sorabh Hamirwasia(@sohami) to be a co-maintainer. Sorabh has kindly accepted.

Sorabh has led the design and implementation of multiple features like query cancellation, concurrent segment search for aggregations and snapshot inter-operability w/remote storage in OpenSearch. Some significant issues and PRs authored by Sorabh for this effort are as follows:

Feature proposals
Concurrent segment search for aggregations : opensearch-project#6798
Searchable Remote Index : opensearch-project#2900

Implementations
Concurrent segment search for aggregations: opensearch-project#7514
Lucene changes to leaf slices for concurrent search: apache/lucene#12374
Moving concurrent search to core : opensearch-project#7203
Query cancellation support : opensearch-project#986
In total, Sorabh has authored 14 PRs going back to Aug 2021. He also frequently reviews contributions from others and has reviewed nearly 20 PRs in the same time frame. I believe Sorabh will be a valuable addition as a maintainer of OpenSearch and will continue to contribute to the success of the project going forward.

Signed-off-by: Bukhtawar Khan <bukhtawa@amazon.com>
Signed-off-by: Ivan Brusic <ivan.brusic@flocksafety.com>

.github/CODEOWNERS

@@ -1 +1 @@
-*   @reta @anasalkouz @andrross @reta @Bukhtawar @CEHENKLE @dblock @gbbafna @setiah @kartg @kotwanikunal @mch2 @nknize @owaiskazi19 @Rishikesh1159 @ryanbogan @saratvemulapalli @shwetathareja @dreamer-89 @tlfeng @VachaShah @dbwiddis @sachinpkale
+*   @reta @anasalkouz @andrross @reta @Bukhtawar @CEHENKLE @dblock @gbbafna @setiah @kartg @kotwanikunal @mch2 @nknize @owaiskazi19 @Rishikesh1159 @ryanbogan @saratvemulapalli @shwetathareja @dreamer-89 @tlfeng @VachaShah @dbwiddis @sachinpkale @sohami

MAINTAINERS.md

@@ -25,6 +25,7 @@ This document contains a list of maintainers in this repo. See [opensearch-proje
 | Sachin Kale              | [sachinpkale](https://github.com/sachinpkale)           | Amazon      |
 | Sarat Vemulapalli        | [saratvemulapalli](https://github.com/saratvemulapalli) | Amazon      |
 | Shweta Thareja           | [shwetathareja](https://github.com/shwetathareja)       | Amazon      |
+| Sorabh Hamirwasia        | [sohami](https://github.com/sohami)                     | Amazon      |
 | Suraj Singh              | [dreamer-89](https://github.com/dreamer-89)             | Amazon      |
 | Tianli Feng              | [tlfeng](https://github.com/tlfeng)                     | Amazon      |
 | Vacha Shah               | [VachaShah](https://github.com/VachaShah)               | Amazon      |