Open external links in new tab as option in the settings

### Is your feature request related to a problem? Please describe
All our customers (over 300) don't want external links to be opened on the same tab.

### Describe the solution you'd like
https://wordpress.org/support/topic/link-to-google-maps-feature-wish/

Options:
- Open in same tab
- Open in new tab
- Disable Link (but show the address)
- Disable it complete

### Describe alternatives you've considered
I read all about your "custom template put into the theme folder" things, but that can't be the final solution.

### Additional context
I read also those posts about "This was intentional. See #1631 and related issue #1473. It is now thought of as best practice for accessibility so that people can choose when they want a link opened in a new tab."

It is a widespread myth (even among experts) that users think it is great to decide for themselves. In practice it looks different -> the visitor clicks on a link and it opens in the same tab ... User disappears from the website and returns to the previous page in 5% of all cases.

Therefore, it would be a great thing if you could include this function in your plugin.

Thx : )

Read the linked WordPress support topic and prior issues #1631 and #1473 first, then trace the plugin's settings and external-link rendering entry points. Done means the requested link behavior is configurable with the listed options and works without requiring a custom theme template.

Written by the indexing model from the issue text.