feat: Add YAML output format to CLI (#2768)

* Add a yaml command line argument

Signed-off-by: Nick Hoernle <nicholas.hoernle@gmail.com>

* Use yaml and not yml

Co-authored-by: Michele Dolfi <97102151+dolfim-ibm@users.noreply.github.com>
Signed-off-by: Nick Hoernle <nicholas.hoernle@gmail.com>

* Use the same naming convention yaml in the variable names as well

Signed-off-by: Nick Hoernle <nicholas.hoernle@quantco.com>

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Signed-off-by: Nick Hoernle <nicholas.hoernle@gmail.com>
Signed-off-by: Nick Hoernle <nicholas.hoernle@quantco.com>
Co-authored-by: Michele Dolfi <97102151+dolfim-ibm@users.noreply.github.com>