[Dev][Gandiva] Add Gandiva code owners

[kou]

Describe the enhancement requested

We have some Gandiva PRs that are waiting for review:

https://github.com/apache/arrow/pulls?q=is%3Apr+is%3Aopen+label%3A%22Component%3A+Gandiva%22

@dmitry-chirkov-dremio @lriggs @akravchukdremio @xxlaykxx How about adding you to code owners of Gandiva?

diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index 4ed06090c3..26e8935ec0 100644
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -55,6 +55,7 @@ compose.yaml @assignUser @jonkeane @kou @raulcd
 /cpp/src/arrow/adapters/orc @wgtmac
 /cpp/src/arrow/engine @westonpace
 /cpp/src/arrow/flight/ @lidavidm
+/cpp/src/gandiva @dmitry-chirkov-dremio @lriggs @akravchukdremio @xxlaykxx
 /cpp/src/parquet @wgtmac
 
 ## MATLAB

If you're code owners of Gandiva, you can get notifications when Gandiva PRs are opened.

Component(s)

Developer Tools, Gandiva

[lriggs]

Thanks @kou, adding the four of us is a great idea.

[kou]

Thanks. I've opened a PR for this: #50144