models: Move model into their own directory

This allows there to be a file that is a list of models that is
not mixed into the runner code.

model/models/models.go

+package models
+
+import (
+	_ "github.com/ollama/ollama/model/models/llama"
+	_ "github.com/ollama/ollama/model/models/mllama"
+)

server/prompt.go

@@ -11,7 +11,7 @@ import (
 
 	"github.com/ollama/ollama/api"
 	"github.com/ollama/ollama/llm"
-	"github.com/ollama/ollama/model/mllama"
+	"github.com/ollama/ollama/model/models/mllama"
 	"github.com/ollama/ollama/template"
 )
 

server/routes.go

@@ -32,7 +32,7 @@ import (
 	"github.com/ollama/ollama/envconfig"
 	"github.com/ollama/ollama/fs/ggml"
 	"github.com/ollama/ollama/llm"
-	"github.com/ollama/ollama/model/mllama"
+	"github.com/ollama/ollama/model/models/mllama"
 	"github.com/ollama/ollama/openai"
 	"github.com/ollama/ollama/template"
 	"github.com/ollama/ollama/types/errtypes"