Adjust templates for FIM models to acknowledge existence of suffix

### What is the issue? CodeGemma (for example, it's not the only one) supports both FIM and chat. Ollama uses the FIM template for codegemma:2b and the chat template for codegemma:7b. This feels like the right default decision, but in cases where a suffix is provided, it can be confidently assumed that a FIM format is desired. The solution to this would be a prompt template that is wrapped in an "if suffix", something like this: ``` {{- if .Suffix }}<|fim_prefix|>{{ .Prompt }}<|fim_suffix|>{{ .Suffix }}<|fim_middle|> {{- else }}<start_of_turn>user {{ if .System }}{{ .System }} {{ end }}{{ .Prompt }}<end_of_turn> <start_of_turn>model {{ .Response }}<end_of_turn> {{- end }} ``` One caveat I can see is it would make the prompt template slightly less readable for users browsing the Ollama template library. ### OS macOS ### GPU Apple ### CPU Apple ### Ollama version 0.3.11