Extracts the batch logic into a common file

[bltavares]

All the batch commands have a similar structure:

• Read from a cache
• Read the content from a file
• Verify if the content of the file is on the cache
• Fallback to a clean URL if the strict search does not work
• Act on the content, either the ID or the URL

Only the last part changes depending on the command. This commit extracts the logic into a BatchApp, which is responsible to produce the in-memory content and centralize the matching logic.