Allow specifying 2 .framework files to diff

[goergisn]

Summary

• You can now provide 2 paths to .framework files to diff

From .framework to Output

USAGE: public-api-diff framework --new <new> --old <old> --target-name <target-name> [--swift-interface-type <swift-interface-type>] [--old-version-name <old-version-name>] [--new-version-name <new-version-name>] [--output <output>] [--log-output <log-output>] [--log-level <log-level>]
OPTIONS:
  --new <new>             Specify the updated .framework to compare to
  --old <old>             Specify the old .framework to compare to
  --target-name <target-name>
                          The name of your target/module to show in the output
  --swift-interface-type <swift-interface-type>
                          [Optional] Specify the type of .swiftinterface you
                          want to compare (public/private) (default: public)
  --old-version-name <old-version-name>
                          [Optional] The name of your old version (e.g. v1.0 /
                          main) to show in the output
  --new-version-name <new-version-name>
                          [Optional] The name of your new version (e.g. v2.0 /
                          develop) to show in the output
  --output <output>       [Optional] Where to output the result (File path)
  --log-output <log-output>
                          [Optional] Where to output the logs (File path)
  --log-level <log-level> [Optional] The log level to use during execution
                          (default: default)
  -h, --help              Show help information.

Run as debug build

swift run public-api-diff
    framework
    --target-name "TargetName"
    --new "new/path/to/project.framework" 
    --old "old/path/to/project.framework"