`iceberg` table format support for `filesystem` destination

[jorritsandbrink]

closes #1996

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[jorritsandbrink]

@rudolfix / @sh-rp this PR isn't there yet but can you give an intermediate review?

What still needs to happen:

• Azure/GCS support
• partitioning
• add iceberg to more of the existing delta tests
• probably some other things

Notes:

• I suggest we try adding partitioning in a follow-up PR. I looked at it but couldn't easily implement it:
  1. confusing API
  2. lack of documentation
  3. incorrect documentation
  4. bugs (or I am doing something wrong, which is not unlikely given 1/2/3)
• I faced some issues with dependency management; see pyproject.toml.