create a new branch with this repository's history rewritten according to the --as <subdirectory>
USAGE:
mgt split-out-as [FLAGS] --as <subdirectory> --output-branch <branch-name>
FLAGS:
--verbose Prints verbose information
--dry-run Print out the steps taken, but don't actually run or change anything.
-h, --help
OPTIONS:
-o, --output-branch OUTPUT-BRANCH name of branch that will be created with new split
history
--as AS-SUBDIR path relative to root of the local repository that will
contain the entire repository being split