Support directory expansion in Skylark Args.
This is controlled by a flag "expand_directories", whose default value is controlled by --incompatible_expand_directories.
Example:
directory = ctx.actions.declare_directory('dir')
...
args = ctx.actions.args()
args.add_all([directory])
The resulting command line will now contain the directory contents instead of the path to the directory.
RELNOTES[INC]: Adds --incompatible_expand_directories to automatically expand directories in skylark command lines. Design doc: https://docs.google.com/document/d/11agWFiOUiz2htBLj6swPTob5z78TrCxm8DQE4uJLOwM
PiperOrigin-RevId: 210155043
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