gtags module and lookup modules with prompting

### Describe your request

Are there any plans to add support for gtags? Also wondering whether lookup module supports prompting before following a lookup. ie, instead of always using symbols at point, can we make it prompt? xref does support using universal arguments, but lookup module uses universal argument for other purposes.

### Briefly explain its use-case

gtags module allows to do symbol lookup using GNU global project. The prompt support allows overriding the symbol picked at point and gives the user a chance to update/review the symbol.