Use GQL schema stitching to proxy queries to multiple watchers (#18)

* Use apollo federation router to proxy gql queries to multiple watchers

* Use graphql stitch to proxy requests to all watchers

* Load watcher endpoints and prefixes from json

* Transpile typescript and setup lint

* Change conflicting metrics ports

* Add comments

packages/linear-star-release-watcher/environments/local.toml

@@ -1,6 +1,6 @@
 [server]
   host = "127.0.0.1"
-  port = 3009
+  port = 3007
   kind = "lazy"
 
   # Checkpointing state.
@@ -32,9 +32,9 @@
 
 [metrics]
   host = "127.0.0.1"
-  port = 9000
+  port = 9012
   [metrics.gql]
-    port = 9001
+    port = 9013
 
 [database]
   type = "postgres"
@@ -48,8 +48,8 @@
 
 [upstream]
   [upstream.ethServer]
-    gqlApiEndpoint = "http://127.0.0.1:8082/graphql"
-    rpcProviderEndpoint = "http://127.0.0.1:8081"
+    gqlApiEndpoint = "http://127.0.0.1:8083/graphql"
+    rpcProviderEndpoint = "http://127.0.0.1:8082"
 
   [upstream.cache]
     name = "requests"