Add support for scheduled checks for changes in tracked web page resources

[azasypkin]

Summary

Currently, users are required to manually trigger the web page resources tracker to re-fetch web page resources whenever they want to check for any changes. This limitation significantly reduces the value that users can get from the web page resources tracker. To address this issue, we should allow users to specify an interval when Secutils.dev automatically re-fetches web page resources and notifies the user about any detected changes, if applicable.

Limitations:

• Notifications will be sent only to the email specified by the user during registration
• The re-fetch interval shouldn't be less than one day and not more than 90 days

Tasks

Beta Give feedback

1. Implement resources filters in Make it possible to ignore changes in specificed web page resources #19
2. Implement resources check schedule

Blocked: #19

[azasypkin]

Already implemented in a number of the latest commits.