feat: add amazonbedrock (#718)

* add amazonbedrock AI provider

Signed-off-by: Su Wei <suwei007@gmail.com>

* add amazonbedrock, change model list to const var

Signed-off-by: Su Wei <suwei007@gmail.com>

* update iai config and auth cmd, add providerRegion

Signed-off-by: Wei Su <wsuam@amazon.com>

* fix filename wrong

Signed-off-by: Wei Su <wsuam@amazon.com>

* chore: added some doc info

Signed-off-by: Alex Jones <alexsimonjones@gmail.com>

---------

Signed-off-by: Su Wei <suwei007@gmail.com>
Signed-off-by: Wei Su <wsuam@amazon.com>
Signed-off-by: Alex Jones <alexsimonjones@gmail.com>
Co-authored-by: Wei Su <wsuam@amazon.com>
Co-authored-by: Aris Boutselis <aris.boutselis@senseon.io>
Co-authored-by: Alex Jones <alexsimonjones@gmail.com>

cmd/auth/auth.go

@@ -19,12 +19,13 @@ import (
 )
 
 var (
-	backend     string
-	password    string
-	baseURL     string
-	model       string
-	engine      string
-	temperature float32
+	backend        string
+	password       string
+	baseURL        string
+	model          string
+	engine         string
+	temperature    float32
+	providerRegion string
 )
 
 var configAI ai.AIConfiguration