feat(Dropdown): add placement prop

[malta895]

Description

Added Dropdown placement prop, which allows to set the placement of the dropdown relative to the parent

Dropdown

- added `placement` prop

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[fredmaggiowski]

I'd improve the prop management

[malta895]

I'd improve the prop management

Aside for the typing, and the default value, is there something else you think should be improved in props management?

[fredmaggiowski]

LGTM