feat: allow global LF namespace

[GuillaumeNury]

Description

Some apps will use different versions of LF. So it has to be namespaced.

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Allows importing LF inside a selector with:

@use "@lucca-front/scss/src/commons/config" as scssConfig with (
  $namespace: ".lucca-principal-container"
);
@use "@lucca-front/icons/src/commons/config" as iconsConfig with (
  $namespace: ".lucca-principal-container"
);

@forward "@lucca-front/icons/src/main";
@forward "@lucca-front/scss/src/main";
@forward "@lucca-front/scss/src/components/button";
@forward "@lucca-front/scss/src/components/callout";
@forward "@lucca-front/ng/src/components/popover";
@forward "@lucca-front/ng/src/components/popup";
@forward "@lucca-front/ng/src/components/cdk/global";
@forward "@lucca-front/ng/src/components/cdk/overlay";

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