Improve the CLI experience

[christianhelle]

Improve the output when running the CLI tool by switching to the library Spectre.Console instead of McMaster.Extensions.Hosting.CommandLine

Use Refitter as an inspiration for the CLI tool experience

Refitter CLI output screenshot:

Refitter CLI tool enhancement PR
christianhelle/refitter#695

HTTP File Generator tool enhancement PR
christianhelle/httpgenerator#211