feat: embedded model configurations, add popular model examples, refactoring (#1532)

* move downloader out

* separate startup functions for preloading configuration files

* docs: add popular model examples

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

* shorteners

* Add llava

* Add mistral-openorca

* Better link to build section

* docs: update

* fixup

* Drop code dups

* Minor fixups

* Apply suggestions from code review

Signed-off-by: Ettore Di Giacinto <mudler@users.noreply.github.com>

* ci: try to cache gRPC build during tests

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

* ci: do not build all images for tests, just necessary

* ci: cache gRPC also in release pipeline

* fixes

* Update model_preload_test.go

Signed-off-by: Ettore Di Giacinto <mudler@users.noreply.github.com>

---------

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>
Signed-off-by: Ettore Di Giacinto <mudler@users.noreply.github.com>

embedded/models/mistral-openorca.yaml

@@ -0,0 +1,23 @@
+name: mistral-openorca
+mmap: true
+parameters:
+  model: huggingface://TheBloke/Mistral-7B-OpenOrca-GGUF/mistral-7b-openorca.Q6_K.gguf
+  temperature: 0.2
+  top_k: 40
+  top_p: 0.95
+template:
+  chat_message: |
+    <|im_start|>{{if eq .RoleName "assistant"}}assistant{{else if eq .RoleName "system"}}system{{else if eq .RoleName "user"}}user{{end}}
+    {{if .Content}}{{.Content}}{{end}}
+    <|im_end|>
+    
+  chat: |
+    {{.Input}}
+    <|im_start|>assistant
+    
+  completion: |
+    {{.Input}}
+context_size: 4096
+f16: true
+stopwords:
+- <|im_end|>