Add meta.mockDates so users can fix/mock dates for testing

[tajo]

fixes #301

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Latest commit: b89848f84f318872d71a00ea852d3d158a989735

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This PR includes changesets to release 11 packages

| Name | Type | | ----------------- | ----- | | @ladle/react | Patch | | example | Patch | | test-addons | Patch | | test-babel | Patch | | test-config | Patch | | test-config-ts | Patch | | test-css | Patch | | test-decorators | Patch | | test-playwright | Patch | | test-programmatic | Patch | | test-provider | Patch |

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