Support an `updateOrCreate()` method for Entry and Term repositories

[aaronbushnell]

The work from statamic/cms#9815 is a great idea from @godismyjudge95, however, Jason noted there's some complexity to implement these methods into Statamic as-is. Totally understandable, so I wanted to create a formal post here to document this feature request.

We've been working with a number of clients and migrating their content to a new Statamic build. Part of that usually involves creating some quick commands to import their content into the CMS. Because the build can take a bit of time, we find our imports are rarely one-and-done. Having an updateOrCreate() would allow us to easily:

1. Update existing entries that have been imported
2. Create new entries that have not yet been imported

[godismyjudge95]

Yep, imports are exactly where we were feeling the verboseness of the current setup. Probably going add some helpers to our internal plugin in the meantime.

[aaronbushnell]

Do you ever plan on publishing your plugin at some point, @godismyjudge95? Would love to use and contribute to it! I've gotten a lot of mileage out of this helper to create assets out of URLs (including resizing them) https://gist.github.com/aaronbushnell/91dd215930ffcb8fdcbb42fe368b5634

[godismyjudge95]

Do you ever plan on publishing your plugin at some point, @godismyjudge95? Would love to use and contribute to it! I've gotten a lot of mileage out of this helper to create assets out of URLs (including resizing them) gist.github.com/aaronbushnell/91dd215930ffcb8fdcbb42fe368b5634

Might just make a package and not publish it to the Statamic marketplace. It's not really a finished package per-se just a collection of handy helpers