Cosmos: project depends on azure/identity (Azure#14237)

The package.json for the project needs to have the identity package
within its dependencies, not the dev dependencies, or else it will
cause problems when building in TypeScript projects.

This:

- moves the package from dev deps to deps
- moves a types package from deps to dev deps

Note, there is reference to a library called @azure/dev-tool that
is not published, so I am unable to run tests.

See also:
- Azure#13202
- Azure#14236

Author: jeffwilcox

sdk/cosmosdb/cosmos/package.json

@@ -87,7 +87,7 @@
   },
   "dependencies": {
     "@azure/core-auth": "^1.2.0",
-    "@types/debug": "^4.1.4",
+    "@azure/identity": "^1.1.0",
     "debug": "^4.1.1",
     "fast-json-stable-stringify": "^2.0.0",
     "jsbi": "^3.1.3",
@@ -102,10 +102,10 @@
   "devDependencies": {
     "@azure/dev-tool": "^1.0.0",
     "@azure/eslint-plugin-azure-sdk": "^3.0.0",
-    "@azure/identity": "^1.1.0",
     "@microsoft/api-extractor": "7.7.11",
     "@rollup/plugin-json": "^4.0.0",
     "@rollup/plugin-multi-entry": "^3.0.0",
+    "@types/debug": "^4.1.4",
     "@types/fast-json-stable-stringify": "^2.0.0",
     "@types/mocha": "^7.0.2",
     "@types/node": "^8.0.0",