Content creator for primitives API

[jeffsee55]

Fix error when re-ordering block/group-lists, add content creator for primitives api

Closes #340

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Latest commit: cba5713

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[logan-anderson]

Getting this error when trying to load locahost:3000 on tina-cloud-starter-experimental

error - ../../.yarn/$$virtual/@tinacms-form-builder-virtual-442d544751/0/cache/@tinacms-form-builder-npm-0.43.0-8913072ca6-796731ef79.zip/node_modules/@tinacms/form-builder/build/index.js:1:15
Module not found: @tinacms/form-builder tried to access react-beautiful-dnd (a peer dependency) but it isn't provided by its ancestors; this makes the require call ambiguous and unsound.

Required package: react-beautiful-dnd (via "react-beautiful-dnd")
Required by: @tinacms/form-builder@virtual:f8917c6dde17839096e720fcc601c842bbe708e8beca714e81fb51ae687d6505364d2f37c80a557d4a9ca74ac16212f2229996c426a482c9a90e797bdef0f4f8#npm:0.43.0 (via /Users/logananderson-forestry-mac/dev/tinacms/tina-graphql-gateway/.yarn/$$virtual/@tinacms-form-builder-virtual-442d544751/0/cache/@tinacms-form-builder-npm-0.43.0-8913072ca6-796731ef79.zip/node_modules/@tinacms/form-builder/build/index.js)
Ancestor breaking the chain: tina-graphql-gateway@virtual:2b2aaae62b5397fe1a167fe925efc38928570fe879f2f4cea3a913c70e43865d1b895f665773c1b227c3bd0f10086a84642bd926d3ac5e759332669954c6a10c#workspace:packages/tina-graphql-gateway

Not sure if it is from this PR or not