[WIP] Svelte Child components

[yifanplanet]

Code changes

Current issues:

• [x] Some styles are missing from the compiled bundle, we think it might be related to svelte having some difficulty compiling scss with this workaround https://github.com/nylas/components/pull/350/files#diff-5330159ddf6d2bb56f34d850d145df3e3962f342ff29992dabe6df366b8ffc22R103
• [x] Need to figure out the order of operations for this rollup config, it doesn't seem to find the bundled css and it errors when trying to import https://github.com/nylas/components/pull/350/commits/638fbf6adac35f3ac8772b826a98c0fc592fefec#diff-5330159ddf6d2bb56f34d850d145df3e3962f342ff29992dabe6df366b8ffc22R107

License

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