Fix #358

[ccarmox]

The path where the "third_party_license_metadata" and "third_party_licenses" files are stored has been changed from "raw" to "res/raw" to make it accessible from the application, fixing bug #358

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[timothyfroehlich]

Thank you for looking into this and submitting a fix!

However, this PR should not be merged because the current implementation in main is actually correct due to a recent architectural change in the plugin.

The oss-licenses-plugin was recently updated to use the modern AGP Variant API for generating resources. When using variant.sources.res.addGeneratedSourceDirectory, AGP treats the provided output directory as a res root.

Therefore, any task generating resources must mimic the standard Android res folder structure directly inside that root directory. By creating the raw folder directly (e.g., generated_dir/raw/), AGP correctly identifies it as a raw resource type and packages it.

If we were to apply this PR, the path would become generated_dir/res/raw/. AGP would see a top-level folder named res, which is not a valid Android resource type (like values, layout, or raw), and would silently fail to package the licenses, breaking the plugin for everyone using modern AGP versions.

The bug reported in #358 was likely caused by an incomplete migration or temporary instability in version 0.10.8, but the underlying directory structure logic currently in main is correct for the new Variant API.