Managed + Iceberg IO

[kellen]

Adds support for Beam's managed transforms and for Iceberg, which is implemented as a managed transform.

Note this is on a snapshot of magnolify, will need a release before merge.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 61.32%. Comparing base (a464955) to head (d3b67dc). Report is 27 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5494      +/-   ##
==========================================
- Coverage   61.32%   61.32%   -0.01%     
==========================================
  Files         312      312              
  Lines       11080    11082       +2     
  Branches      770      728      -42     
==========================================
+ Hits         6795     6796       +1     
- Misses       4285     4286       +1     

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[RustedBones]

Converted to draft until magnolify gets released