llama : add --completion-bash option #11846
                
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This commit adds a new option
--completion-bashto the llama.cpp which outputs a source-able bash completion script.The motivation for this change is to provide a more user-friendly experience for users who use the command-line interface of llama.cpp.
This is currently only basic and all options are displayed for all llama executables but this can be improved in the future if needed.
Example usage: