feat(loader) - Add Loader component and remove Spinner component

[ttaylor-stack]

SPARK-117

Figma

As mentioned in the ticket we will not be implementing the Logo Loader in this PR.

NOTES:

• The animation matches what is in the Figma however I think it slightly differs from the icon in the icons package. @CGuindon can you confirm if that's alright?
• I wasn't sure on exact timings of the animation so I tried to match what was in the beta package. cc: @CGuindon
• I've added in a type property in anticipation for the next part of the component. Is this the right choice or should we remove it until the the next part of the component is implemented? @giamir @dancormier

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