feat: openAI explicit value for maxToken and temperature (#659)

* feat: openAI explicit value for maxToken and temp

Because when k8sgpt talks with vLLM, the default MaxToken is 16,
which is so small.
Given the most model supports 2048 token(like Llama1 ..etc), so
put here for a safe value.

Signed-off-by: Peter Pan <Peter.Pan@daocloud.io>

* feat: make temperature a flag

Signed-off-by: Peter Pan <Peter.Pan@daocloud.io>

---------

Signed-off-by: Peter Pan <Peter.Pan@daocloud.io>

cmd/auth/auth.go

@@ -19,11 +19,12 @@ import (
 )
 
 var (
-	backend  string
-	password string
-	baseURL  string
-	model    string
-	engine   string
+	backend     string
+	password    string
+	baseURL     string
+	model       string
+	engine      string
+	temperature float32
 )
 
 var configAI ai.AIConfiguration