feat(action-menu): add <SActionMenu>

[kiaking]

Add action menu component, inspired by GitHub Primer: Action Menu.

It also includes change where DropdownSectionMenu is now directly integrated and using <SActionList> to display the menu.

Adjusting the key differences as well, where action list uses text, dropdown is using label. label is deprecated 👀

<SActionMenu
  label="Open menu"
  :options="dropdownOptions"
/>

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[brc-dd]

table dropdowns look broken

[kiaking]

@brc-dd
Thanks for the catch...! I wasn't handling the deprecated label option correctly... 😢 Fixed!

Also, added <SControlActionMenu>.