Support --cross with the package sub-command

[Gedochao]

Fixes #3591

scala-cli package . --power --cross
# Compiling project (Scala 3.3.7, JVM (23))
# Compiled project (Scala 3.3.7, JVM (23))
# Compiling project (Scala 3.3.7, Scala Native 0.5.10)
# Compiled project (Scala 3.3.7, Scala Native 0.5.10)
# Compiling project (Scala 3.8.2, JVM (23))
# Compiled project (Scala 3.8.2, JVM (23))
# Compiling project (Scala 3.8.2, Scala Native 0.5.10)
# Compiled project (Scala 3.8.2, Scala Native 0.5.10)
# Packaging 4 cross builds...
# Packaging for Scala 3.3.7, JVM...
# Wrote ~/scala-cli-tests/run_3.3.7_JVM, run it with
#   ./run_3.3.7_JVM
# Packaging for Scala 3.8.2, Native...
# (...)
# Wrote ~/scala-cli-tests/run_3.8.2_Native, run it with
#   ./run_3.8.2_Native
# Packaging for Scala 3.8.2, JVM...
# Wrote ~/scala-cli-tests/run_3.8.2_JVM, run it with
#   ./run_3.8.2_JVM
# Packaging for Scala 3.3.7, Native...
# (...)
# Wrote ~/scala-cli-tests/run_3.3.7_Native, run it with
#   ./run_3.3.7_Native