Add CODEOWNERS entry for temporal-plugins #2457

Job	Run time
Code format	53s
Unit test with docker service [JDK8]	13m 48s
Javadoc	3m 7s
Unit test with cloud	4m 35s
Unit test with in-memory test service [Edge]	11m 23s
Build native test server / Build native test server (ubuntu-24.04-arm, linux, arm64)	6m 34s
Build native test server / Build native test server (macos-15-intel, macOS, amd64)	10m 45s
Build native test server / Build native test server (ubuntu-latest, linux, amd64, true)	7m 32s
Build native test server / Build native test server (macos-latest, macOS, arm64)	13m 53s
Build native test server / Build native test server (windows-latest, windows, amd64)	7m 6s
Build native test server / Build native test server (ubuntu-latest, linux, amd64, false)	7m 7s
	1h 26m 43s

Provide feedback