Provide aliases for Spectre.Console features

[Spectre.Console](https://spectresystems.github.io/spectre.console) comes with a bunch of useful features, like Figlet, for which we should provide aliases for better discoverability and convinience.

Start by reviewing the existing Spectre.Console integration and the conventions for aliases in the Cake repository. Identify which features, including Figlet, need aliases and define completion as those aliases being available for the relevant features; the issue names no files or tests.

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