EssCube.GetMembersSearched: Add support for finding members by alias

[MatthewBAllen]

GetMembersSearched only works with member name, not member aliases.

Currently, we're using OutlineViewer.SearchMembers which has no support for search by alias. https://docs.oracle.com/en/database/other-databases/essbase/21/essrt/op-outline-app-cube-get.html#Example-usersget__sect_srch