supporting file formats that have unique paths but duplicate file names

### Describe the problem

F-Droid repositories can include app translations. (_fdroiddata is the internal name for the git repo format for managing an F-Droid repo._) It is inspired by the Fastlane layout, but includes multiple apps in one git repo. Currently, we have a hacky script that converts these files to XLIFF for Weblate to consume. We would like to be able to add _fdroiddata_ git projects directly to Weblate, then use Weblate's support for submitting translations via pull requests.

@jspricke @linsui

### Describe the solution you would like

@nijel what _fdroiddata_ would need is a way to use the full path to represent the strings, e.g. `metadata/*/en-US/summary.txt` would be the source strings. Then the translations would be like:

```
metadata/eu.vranckaert.worktime/cs/summary.txt
metadata/eu.vranckaert.worktime/de/summary.txt
metadata/eu.vranckaert.worktime/en-US/summary.txt
metadata/eu.vranckaert.worktime/es/summary.txt
metadata/eu.vranckaert.worktime/fr/summary.txt
metadata/eu.vranckaert.worktime/he/summary.txt
metadata/eu.vranckaert.worktime/pl/summary.txt
metadata/eu.vranckaert.worktime/pt-BR/summary.txt
metadata/eu.vranckaert.worktime/pt-PT/summary.txt
metadata/eu.vranckaert.worktime/pt/summary.txt
metadata/eu.vranckaert.worktime/ro/summary.txt
metadata/eu.vranckaert.worktime/ru/summary.txt
metadata/eu.vranckaert.worktime/sq/summary.txt
metadata/eu.vranckaert.worktime/sw/summary.txt
metadata/eu.vranckaert.worktime/tr/summary.txt
metadata/eu.vranckaert.worktime/uk/summary.txt
metadata/eu.vranckaert.worktime/zh-CN/summary.txt
metadata/eu.wikijourney.wikijourney/de/summary.txt
metadata/eu.wikijourney.wikijourney/en-US/summary.txt
metadata/eu.wikijourney.wikijourney/es/summary.txt
metadata/eu.wikijourney.wikijourney/fr/summary.txt
metadata/eu.wikijourney.wikijourney/he/summary.txt
metadata/eu.wikijourney.wikijourney/nb/summary.txt
metadata/eu.wikijourney.wikijourney/pl/summary.txt
metadata/eu.wikijourney.wikijourney/pt-BR/summary.txt
metadata/eu.wikijourney.wikijourney/pt-PT/summary.txt
metadata/eu.wikijourney.wikijourney/pt/summary.txt
metadata/eu.wikijourney.wikijourney/ru/summary.txt
metadata/eu.wikijourney.wikijourney/tr/summary.txt
metadata/eu.wikijourney.wikijourney/uk/summary.txt
metadata/eu.wikijourney.wikijourney/zh-CN/summary.txt
metadata/eu.woju.android.packages.hud/cs/summary.txt
metadata/eu.woju.android.packages.hud/de/summary.txt
metadata/eu.woju.android.packages.hud/en-US/summary.txt
metadata/eu.woju.android.packages.hud/es/summary.txt
metadata/eu.woju.android.packages.hud/fr/summary.txt
metadata/eu.woju.android.packages.hud/he/summary.txt
metadata/eu.woju.android.packages.hud/is/summary.txt
metadata/eu.woju.android.packages.hud/pl/summary.txt
metadata/eu.woju.android.packages.hud/pt-BR/summary.txt
metadata/eu.woju.android.packages.hud/pt-PT/summary.txt
metadata/eu.woju.android.packages.hud/pt/summary.txt
metadata/eu.woju.android.packages.hud/ro/summary.txt
metadata/eu.woju.android.packages.hud/ru/summary.txt
metadata/eu.woju.android.packages.hud/sw/summary.txt
metadata/eu.woju.android.packages.hud/tr/summary.txt
metadata/eu.woju.android.packages.hud/uk/summary.txt
metadata/eu.woju.android.packages.hud/zh-CN/summary.txt
metadata/exa.lnx.a/ar/summary.txt
metadata/exa.lnx.a/ca/summary.txt
metadata/exa.lnx.a/cs/summary.txt
metadata/exa.lnx.a/de/summary.txt
metadata/exa.lnx.a/en-US/summary.txt
metadata/exa.lnx.a/eo/summary.txt
metadata/exa.lnx.a/es/summary.txt
metadata/exa.lnx.a/et/summary.txt
metadata/exa.lnx.a/fr/summary.txt
```

### Describe alternatives you have considered

We tried to use the existing Fastlane support, which is similar, but that's not feasible because the Fastlane format is based on there only ever being one string file called `short_description.txt`, etc.

https://github.com/WeblateOrg/weblate/pull/12121

Is this feasible? If it is a big project, would you consider doing it as part of the funding proposal we're putting together?

### Screenshots

_No response_

### Additional context

_No response_