android bundling improvements

replace `jarsigner` with build tools' `apksigner` which is capable of using newer signature schemes

remove the `android-manifest` flag and assume the file exists in the directory we're bundling

make `android-keystore-alias` and `android-keystore-password` optional.
The former is not needed if there's only one key in the keystore, and the latter will be prompted by `apksigner` if missing

don't change the working directory to the bundled directory to prevent confusion when passing a relative path to
`android-keystore`

add the `res`, `assets`, and `lib` directories to the bundle if they exist in the bundled directory

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