Adds Databricks integration (#839)

[edgararuiz]

Details

• Adds board_databricks(), with support for prefix
• Adds necessary methods for new backend: pin_list, pin_exists, pin_meta, pin_store, pin_versions, pin_fetch, pin_delete, pin_version_delete, board_deparse and required_pkgs
• Passes test_api_basic(), test_api_versioning(), test_api_meta().
• Adds necessary tests

Test Results

I am emulating how the other boards implement required_pkgs, but I still get Warnings. Not sure how to address, or if I should address it in this PR.

==> Testing R file using 'testthat'

ℹ Loading pins
[ FAIL 0 | WARN 2 | SKIP 0 | PASS 38 ]Guessing `type = 'rds'`
[ FAIL 0 | WARN 2 | SKIP 0 | PASS 61 ]

── Warning (test-board-databricks.R:10:1): can find board required pkgs ────────
Adding new snapshot:
Code
  required_pkgs(board)
Output
  [1] "httr2"

── Warning (test-board-databricks.R:11:1): can find board required pkgs ────────
Adding new snapshot:
Code
  required_pkgs(board)
Output
  [1] "httr2"
[ FAIL 0 | WARN 2 | SKIP 0 | PASS 61 ]

Test complete

(Fixes #839)

[juliasilge]

I have a request in to CloudOps to get access to Databricks so I can run the tests and such.

[juliasilge]

Thank you so much for all this work @edgararuiz! 🙌

I was able to get access to Databricks and a Volume to test this myself, and all appears to be working well. I also added creds to CI so we can run the tests as part of the check-boards job, which is working well.

[github-actions]

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