GenAI interface (#2790)

* genai interface

* x

* x

* text to speech

* Re-add events package (#2761)

* Re-add events package

* run redis as a dep

* remove redis events

* fix: data race on event subscriber

* fix: data race in tests

* fix: store errors

* fix: lint issues

* feat: default stream

* Update file.go

---------

Co-authored-by: Brian Ketelsen <bketelsen@gmail.com>

* .

* copilot couldn't make it compile so I did

* copilot couldn't make it compile so I did

* x

---------

Co-authored-by: Brian Ketelsen <bketelsen@gmail.com>

genai/default.go

@@ -0,0 +1,16 @@
+package genai
+
+import (
+	"sync"
+)
+
+var (
+	DefaultGenAI GenAI = &noopGenAI{}
+	defaultOnce  sync.Once
+)
+
+func SetDefault(g GenAI) {
+	defaultOnce.Do(func() {
+		DefaultGenAI = g
+	})
+}