refactor!: export types from barrel file

[metonym]

Currently, this library uses sveld to generate TypeScript definitions.

This is a breaking change that instead re-exports and re-uses a base CarbonPictogram class from the barrel file. Reasons are as follows:

• Smaller package
• Much faster to build the library
• Consistent with the approach by carbon-icons-svelte

There should technically be no functional changes, but a major version bump is likely warranted.

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Before

npm notice package size:  698.1 kB                                
npm notice unpacked size: 3.2 MB                                  
npm notice total files:   2371   

After

npm notice package size:  681.6 kB                                
npm notice unpacked size: 2.8 MB
npm notice total files:   2371