[WIP]: Block reworks

[ml-evs]

This PR begins the gradual process of overhauling the data blocks. I've started doing this in steps, that could themselves form separate PRs.

• Retain current block format as a legacy submodule, and switch all existing blocks to that format
• Add draft of a new base block with (somewhat) extensible block schemas and lifecycle hooks
• Update existing routes to work with both legacy and new style blocks
• Try migrating a few blocks to see how they "feel" (started with chat block arbitrarily)

Probably the first point should be merged independently so we can freely try out several possible designs for 2/3.

[cypress]

3 failed tests on run #1039 ↗︎

3

23

0

0

0

Details:

Merge 29c7b93 into c0a6458...
Project: datalab	Commit: 51d8767946 ℹ️
Status: Failed	Duration: 01:40 💡
Started: Feb 25, 2024 1:11 PM	Ended: Feb 25, 2024 1:13 PM

  editPage.cy.js • 1 failed test

View Output

Test		Artifacts
Edit Page > Add some blocks to the sample and checks unsaved warning behavior		Test Replay Screenshots

  sampleTablePage.cy.js • 2 failed tests

View Output

Test		Artifacts
Advanced sample creation features > checks the edit page of the copied sample		Screenshots
Advanced sample creation features > checks the edit page of the copied sample with components		Screenshots

Review all test suite changes for PR #616 ↗︎