Allow blocks or block for block directories

[tlovett1]

For 10up UI Kit, we need to be able to put blocks in the directory block

[changeset-bot]

🦋 Changeset detected

Latest commit: da9c394

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
10up-toolkit	Patch

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[github-actions]

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Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: ✅ success
• Annotations: 0 total

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^{Report generated by eslint-plus-action}

[fabiankaegy]

@tlovett1 @nicholasio I'm a bit worried about this PR introducing unwanted issues for already existing projects. If you previously had a setup where you for example had styles located in a folder called block and are enqueueing them, they will all of the sudden stop working with this update.

Therefore this almost feels like a major version bump because we have introduced a potentially breaking change.

Overall this approach will no longer be necessary once we get #195 since we are moving away from the regex-based system of trying to figure out what is a block and what isn't in favor of using block.json for that.