CLI: support multiple files as input

[xxchan]

so that it can be used in a pipeline's fasion, or multiple globs (expanded by shell).

Currently it accepts a single glob string argument, so it also need to be quoted.

e.g.,

❯ sqllogictest ./**/*.slt  
error: Found argument './examples/condition/condition.slt' which wasn't expected, or isn't valid in this context