feat(template): read jinja templates from gguf files (#4332)

* Read jinja templates as fallback

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

* Move templating out of model loader

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

* Test TemplateMessages

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

* Set role and content from transformers

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

* Tests: be more flexible

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

* More jinja

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

* Small refactoring and adaptations

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

---------

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

core/application/application.go

@@ -0,0 +1,39 @@
+package application
+
+import (
+	"github.com/mudler/LocalAI/core/config"
+	"github.com/mudler/LocalAI/pkg/model"
+	"github.com/mudler/LocalAI/pkg/templates"
+)
+
+type Application struct {
+	backendLoader      *config.BackendConfigLoader
+	modelLoader        *model.ModelLoader
+	applicationConfig  *config.ApplicationConfig
+	templatesEvaluator *templates.Evaluator
+}
+
+func newApplication(appConfig *config.ApplicationConfig) *Application {
+	return &Application{
+		backendLoader:      config.NewBackendConfigLoader(appConfig.ModelPath),
+		modelLoader:        model.NewModelLoader(appConfig.ModelPath),
+		applicationConfig:  appConfig,
+		templatesEvaluator: templates.NewEvaluator(appConfig.ModelPath),
+	}
+}
+
+func (a *Application) BackendLoader() *config.BackendConfigLoader {
+	return a.backendLoader
+}
+
+func (a *Application) ModelLoader() *model.ModelLoader {
+	return a.modelLoader
+}
+
+func (a *Application) ApplicationConfig() *config.ApplicationConfig {
+	return a.applicationConfig
+}
+
+func (a *Application) TemplatesEvaluator() *templates.Evaluator {
+	return a.templatesEvaluator
+}