Added sizes to buttons

[therealsharath]

Description

Closes https://github.com/GTBitsOfGood/bog-component-library/issues/39

This change adds the size functionality, which lets the user toggle the size of the button.

UI Changes

Large Button

Medium Button

Small Button

Type of change

🆕 Feature

How to Test

Clone the repo, then run yarn storybook once the yarn packages are installed.

Checklist

• [x] Code follows design and style guidelines
• [x] Code is commented with doc blocks
• [x] Latest code has been rebased from base branch (usually develop)
• [x] Commits follow guidelines (concise, squashed, etc)
• [x] Github issues have been linked in relevant commits
• [x] Relevant reviewers (EM) have been assigned to this PR

[alysonlam]

Heyo, there's a few things:

1. the font (Visby CF) should be extra bold
2. the padding looks a bit off for each of the sizes
3. I'm adding ss of the dimensions, keep in mind that each font has a specific height and line height This is also added to the button page in the Figma if you want to look back at it

[therealsharath]

@alysonlam I changed the line height to match the Figma docs and the padding to match the commented ss. Any other changes?

[therealsharath]

Large Button

Medium Button

Small Button

Idk how useful these are but I can demo these if that helps! @alysonlam