Add types to clients

[JamieMagee]

Mainly adding typed: true to clients, but also includes:

• Making dependabot.rb and wildcard_matcher.rb typed: strong mostly as a learning experience to see what is required at that type enforcement level
• Define stubs of to_json for Array and Hash
• Define stubs for AWS errors which Sorbet is unable to determine (See The TODO RBI file for more details)
• Wrap *_with_retries clients with T.unsafe as they explicitly rely on method_missing which Sorbet can't deal with

Related to #7782. Supersedes #8028 (as I created that from the main branch of my fork 🤦)