Improve code splitting configuration for ChecLineChart and ChecWysiwyg

[ScopeyNZ]

With 0.1.0 (and #520), we now split ChecLineChart and ChecWysiwyg off into their own file (with their own entry points) to help with code-splitting efforts in consuming packages. This isn't ideal though, as the exports from @chec/ui-library doesn't include it. There's almost certainly a nicer way to do this which I wasn't able to discover. It would be nice to return the components to overall library exports, without impacting the ability for consuming libraries to code-split or tree-shake.