Add validator for the application name

[laicuRoot]

Before, when a user introduce an application name that includes spaces, the script will exit, throwing an error.

In this PR, we confirm the application name by checking that:

• The name is just not numbers.
• The name doesn't include illegal characters.
• If it includes spaces, we parse the name and return the camelized name.

[laicuRoot]

It's my first adventure with Typescript so any feedback is welcome about how to structure the validator in a more TypeScript way 😄 . I've written tests covering all the cases.

[rakeshpetit]

It does not match the string belt, as it is the name of our package.

Should we enforce this? Do we think it's a problem to use belt as the project name?

[laicuRoot]

Hello @rakeshpetit & @stevehanson 👋 Thank you so much for the reviews!

I will remove checking belt as a name app. It is something I saw in the Ignite package and took it from there but I see from the comments that it is unnecessary. Thank you again 🙂

[laicuRoot]

@stevehanson thank you for your help with this! It was bank holiday on Friday so I missed the notification of the changes. Thank you again 🙏