feat(MessageButton): builder and associated interfaces

[monbrey]

The MessageButton builder, in TypeScript

• Builder class for Message Buttons
• Interfaces and types
• Some Util functions as static methods that would probably belong better elsewhere
• Added ow as a dependency to validate input
• Tests

This is a draft for now for a few reasons:

• Unsure if it needs to extend a base component class or not
• It's the first time I've used jest for anything, so will need advise/reviews on the tests
• I've re-written a lot of types that could just be imported from discord-api-types, but it would require bumping the dependency version to 0.19

Status and versioning classification: TBD

[codecov-commenter]

Codecov Report

Merging #6 (2aea829) into main (97cf337) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main        #6   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         2    +1     
  Lines           12        61   +49     
  Branches         4        19   +15     
=========================================
+ Hits            12        61   +49     

Impacted Files	Coverage Δ
src/components/MessageButton.ts	100.00% <100.00%> (ø)
src/messages/formatters.ts	100.00% <0.00%> (ø)

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