Allow fetching seen/read messages via scheduler

[ohader]

Usually the schedule:run command invokes freescout:fetch-emails, but only fetches unseen (not read by anybody else, yet). This change allows to configure this behavior and to fetch seen/read messages.

The new option app.fetch_unseen can be configured via .env:

APP_FETCH_UNSEEN=0

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Example of a schedule:run execution, using APP_FETCH_UNSEEN=0:

$ php artisan schedule:run
Running scheduled command: '/usr/bin/php8.2' 'artisan' freescout:fetch-monitor > '/dev/null' 2>&1
Running scheduled command: '/usr/bin/php8.2' 'artisan' freescout:check-conv-viewers > '/dev/null' 2>&1
Running scheduled command: '/usr/bin/php8.2' 'artisan' freescout:fetch-emails --identifier=[redacted] --unseen=0 > '/home/[redacted]/storage/logs/fetch-emails.log' 2>&1

[mattly6]

Hi, is there a way to download both read and unread messages with this change?