scouting: Add support /requests/request/all_matches

This patch adds a new endpoint that accepts the `RequestAllMatches`
message. It simply returns the full list of matches that the database
knows about.

I decided to change public `int` members in the `db` module to `int32`
so they match the flatbuffer definition. This makes comparison
simpler.

Signed-off-by: Philipp Schrader <philipp.schrader@gmail.com>
Change-Id: I9bb2eed020e2889644f5a122105a232a68f2f4bd
diff --git a/scouting/webserver/requests/debug/BUILD b/scouting/webserver/requests/debug/BUILD
index cfeee2f..189296d 100644
--- a/scouting/webserver/requests/debug/BUILD
+++ b/scouting/webserver/requests/debug/BUILD
@@ -8,6 +8,7 @@
     visibility = ["//visibility:public"],
     deps = [
         "//scouting/webserver/requests/messages:error_response_go_fbs",
+        "//scouting/webserver/requests/messages:request_all_matches_response_go_fbs",
         "//scouting/webserver/requests/messages:submit_data_scouting_response_go_fbs",
     ],
 )