Localize internal strings in ui, material and material3

[m-sasha]

Currently the user-visible strings Compose Multiplatform uses internally (e.g. "Copy" and "Paste" in context menus) are always in English. This PR adds translations of these strings to all the locales Android has localization for at https://github.com/androidx/androidx/tree/androidx-main/compose/ui/ui/src/androidMain/res

The translations are obtained by a Gradle task that check out the corresponding repository, reads the respective strings.xml files and writes Kotlin code with the translations.

Limitations:

1. The translation is done according to the system locale and is not refreshed if it changes. Users will need to restart the app after changing the system locale.
2. There is no facility for the developer to override the localized strings.
3. There is no facility for the developer to specify the locale to parts of the UI, or even globally. The only point of control the developer has is, on JVM targets, to set Locale.setDefault before showing the UI.
4. The "framework" for translating is repeated (copy/pasted) in each module. We could try extracting it into a separate module, but I didn't feel it was worth the effort. It's only a few functions.

Note that this is a temporary solution until the official resources library is stable.

Note for changelog

To disable the localization of internal Compose strings and use the English version, set the system locale before showing any UI:

• Desktop: java.util.Locale.setDefault(java.util.Locale("en"))
• iOS:
• Web:

Proposed Changes

1. Update the ui module to use a "Strings" mechanism similar to how localization is done in material and material3 modules.
2. Set up a mechanism for strings to be translated according to the system locale.
3. Implement a Gradle task that pulls translations from the Android/Compose repo and writes Kotlin files with the translations.
4. Use the Gradle task to generate translations for ui, material and material3 modules.

I recommend reviewing this PR commit-by-commit.

Testing

Test: Manually, and with some new unit tests.

Issues Fixed

Fixes: JetBrains/compose-multiplatform#3360

[m-sasha]

@terrakok @igordmn ping

[igordmn]

Looks good, thanks!