Add SIPCallDirection to SIPCallInfo (#938)

---------

Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>

Author: biglittlebigben

.changeset/yellow-poets-teach.md

@@ -0,0 +1,5 @@
+---
+"@livekit/protocol": patch
+---
+
+Add SIPCallDirection to SIPCallInfo