Add SVG component type declaration generation and verification

[nathanmarks]

The generated SVG components weren't getting declarations generated. Didn't see this in a consuming project initially as the TS compiler allowed the global declaration for .svg modules in said project to apply to the imports ending in .svg.

This now generates declarations for those files.

I've also added two additional steps to the build verification process:

• Will verify that the TS compiler is satisfied with the declarations output into the dist dir
• Ensures that the ESM build bundles without error and performs the same checks against the resulting bundle as we perform against the UMD build.

[codecov[bot]]

Codecov Report

Merging #344 into master will not change coverage. The diff coverage is n/a.

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##           master     #344   +/-   ##
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  Coverage   82.22%   82.22%           
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  Lines        1221     1221           
  Branches      218      218           
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  Hits         1004     1004           
  Misses        165      165           
  Partials       52       52