feat(pivot): RS, SF, BQ

[raphaelvignes]

Implement a static pivot step for:

• Snowflake
• Redshift
• BigQuery

[render[bot]]

Your Render PR Server URL is https://weaverbird-playground-pr-1453.onrender.com.

Follow its progress at https://dashboard.render.com/web/srv-cbv6ht82i3mor8qdd0ig.

[codecov[bot]]

Codecov Report

Merging #1453 (fd56160) into master (4d42216) will increase coverage by 0.00%. The diff coverage is n/a.

:exclamation: Current head fd56160 differs from pull request most recent head bef4031. Consider uploading reports for the commit bef4031 to get more accurate results

@@           Coverage Diff           @@
##           master    #1453   +/-   ##
=======================================
  Coverage   98.47%   98.47%           
=======================================
  Files         212      212           
  Lines        6083     6084    +1     
  Branches      956      956           
=======================================
+ Hits         5990     5991    +1     
  Misses         93       93           

Impacted Files	Coverage Δ
weaverbird/src/lib/steps.ts	100.00% <0.00%> (ø)
...verbird/src/components/stepforms/PivotStepForm.vue	97.05% <0.00%> (+0.08%)	:arrow_up:

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[raphaelvignes]

[raphaelvignes]

TODO: Pimp the multi input field.

• Add a title
• Sanitize the input (handle strings with whitespace) or perhaps it's a backend issue.
• Refactor a bit to mutualize some pivot's methods code.

[davinov]

Closing this PR, stale for a long time