feat(validate): add multiple file arguments to CLI

[umarhussain15]

The CLI can now accept multiple file arguments. These arguments can be file paths or glob-pattern. In case of glob-pattern, all the matched paths are added to validation.

For bundle command it explicitly checks that only one path is given. If multiple arguments are given of a glob-pattern which matches multiple files it throws an error.

[ihorbond]

it's a shame this never got merged :(