Add upload tool and related APIs (#187)

* Add utils for r2 upload

* Add the tool and new routes

* fix auth issue

* sign headers

* add comment

* use our own API key to auth signed uploads

* Restructure things slightly

* tweak

* tweak

* add comments

* tweak

* revert a thing

* twaek

* drop mime type filtering

* new incarnation of mime type filtering

* jsut allow all octet-streams

* simplify further

* tweak

* update lockfile

---------

Co-authored-by: Colin McDonnell <colinmcd94@gmail.com>

test/restricted.ts

@@ -1,5 +1,5 @@
 import type { AgentResult, ValidationCheck } from "./utils.ts";
-import { generateAgentUuids, defineFixture, getAgentOutput, runTests } from "./utils.ts";
+import { defineFixture, generateAgentUuids, getAgentOutput, runTests } from "./utils.ts";
 
 /**
  * restricted test - validates bash=restricted environment filtering.