feat(api): add Cognito user pools to the cloud explorer

Adds a userpools catalog entry, schema and AwsUserPoolsAdapter, verified
against Floci core:

- list/get/create/delete user pools; create can set email or username
  sign-in, a relaxed password policy for local test users, and a public
  app client (on by default) whose id is surfaced in the pool metadata
- users as the pool's child items: list (paged), get, create and delete;
  passwords are set permanent by default so users can sign in at once
- map Cognito's HTTP-400 error names (UserNotFoundException,
  UsernameExistsException, AliasExistsException, InvalidPasswordException)
- link Floci's cognito-idp service to the new page on the diagnostics page

packages/api/package.json

@@ -18,6 +18,7 @@
     "@aws-sdk/client-codebuild": "^3.1076.0",
     "@aws-sdk/client-codedeploy": "^3.1144.0",
     "@aws-sdk/client-codepipeline": "^3.1076.0",
+    "@aws-sdk/client-cognito-identity-provider": "^3.1146.0",
     "@aws-sdk/client-dynamodb": "^3.1088.0",
     "@aws-sdk/client-ec2": "^3.1076.0",
     "@aws-sdk/client-ecr": "^3.1076.0",