picks

[gogonzo]

Closes insightsengineering/NEST-roadmap#36

Check also with:

• picks teal.transform#270
• Adds validate_input() -- previously named as "picks" teal#1642

In this PR, due to the fact that data_extract_spec is not 1:1 convertible to picks, I propose to have an S3 method in each tm_ to switch between data_extract_spec/picks depending on the input type. Eventually, data_extract_spec variant will be removed completely after deprecation period.

[llrs-roche]

Commenting here so we don't forget: tm_gtsummary will need to be added to this PR.

[github-actions]

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