Blueprint to enable all three DataViews Gutenberg experiments

[bph]

These three experiments are enabled in one step.

• Data Views: add Custom Views
• Data Views: enable for Posts
• Data Views: add Quick Edit

[github-actions]

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Test this pull request with WordPress Playground.

[zaerl]

@bph I see this PR on draft. Do you think this needs additional changes, or is it ready?

[bph]

Thank you for the ping @zaerl I'll get back to it later this week.

[bph]

Hi @zaerl I just added the step to set the admin color to 'modern' and it's now ready to review/merge, if you agree,

[zaerl]

I'm ok with this. Good work.