Add graceful shutdown which stops jamid

Change-Id: I0268077ae05f84eb8c6e7fcbbf32ce2a562c7970
diff --git a/server/src/jamid/jami-swig.ts b/server/src/jamid/jami-swig.ts
index 3f48fbc..63fc307 100644
--- a/server/src/jamid/jami-swig.ts
+++ b/server/src/jamid/jami-swig.ts
@@ -51,6 +51,7 @@
 
 export interface JamiSwig {
   init(args: Record<string, unknown>): void;
+  fini(): void;
 
   // IntVect(): IntVect;
   // UintVect(): UintVect;