Motivation

The nix cli should allow aliases to be used as flags. Examples:

• --max-jobs has an alias --build-max-jobs
• --keep-derivations has an alias --gc-keep-derivations
• --sandbox has an alias --build-use-sandbox

Context

Fixes #10989

Per the issue, the nix CLI should allow aliases to be used as flags. Currently, the cli prevents this and throws an unrecognized error. Looks like this behavior was implemented but not enabled so I've added some very small changes to BaseSettings<T>, BaseSettings<bool>, and BaseSettings<SandboxMode> to fix this.

Also added 2 tests to make sure all 3 types work.

Example from the issue works now:

nix eval --extra-experimental-features nix-command --expr '{}' --cores 1
nix eval --extra-experimental-features nix-command --expr '{}' --build-cores 1

Also returns the same error:

nix build --extra-experimental-features nix-command --extra-experimental-features flakes --build-max-jobs -1 nixpkgs#hello
nix build --extra-experimental-features nix-command --extra-experimental-features flakes --max-jobs -1 nixpkgs#hello

> error: configuration setting 'max-jobs' should be 'auto' or an integer

Feel free to close if this behavior isn't desired.

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