feat: `<switch>` expression tag

[fabrice8]

Scope

It's a new tag

Description

Use <switch> expression tag.

Motivation and Context

Improve DX by providing concise alternative to a long cascade of <if-else> statement tags within your template

Checklist:

• [x] I have updated/added documentation affected by my changes.
• [x] I have added tests to cover my changes.

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: fabrice8 / name: Fabrice K.M. Ekpetse (20f28e86d751878c51ac1118c6eca94b487b85c8)