yoshi-java as CODEOWNERS (#3798)
yoshi-java as CODEOWNERS (#3798)

* yoshi-java as CODEOWNERS for majority of repo

* Remove saicheems, jabubake, vkedia, neozwu. Add snehashah16 to spanner

vam-google/google-cloud-java,vam-google/google-cloud-java,vam-google/google-cloud-java,vam-google/google-cloud-java,vam-google/google-cloud-java,vam-google/google-cloud-java