input/output options for `transpile` command

[jiwonz]

If those options are given, they will replace the input and ouput from the manifest(or, can called 'config' the dalbit.toml file) if they were set.

If it is not given as a manifest or options, it should raise an error saying that no input/output is given.

The example:

# dalbit.toml
input = "some_other.luau"
# output = "input and output fields are fully optional now but you must pass `--output` option in the command"

dalbit transpile --input some.luau --output some.lua