Write manual type declarations for all modules

[rowanmanning]

In #927 we added the ability for a module to have manually-written type declarations that are committed to the repo. We need to migrate all the remaining modules. This mega-issue will keep track of progress and contain notes on the process.

• app-info
• crash-handler
• errors
• eslint-config
• fetch-error-handler
• log-error
• middleware-log-errors
• middleware-render-error-info
• opentelemetry
• serialize-error
• serialize-request
• logger