[WIP] feature branch for mp/ddp work

[raubitsj]

https://wandb.atlassian.net/browse/WB-NNNN https://wandb.atlassian.net/browse/CLI-NNNN https://github.com/wandb/client/issues/NNNN

Description

This branch should:

• [ ] Pass all tests at: https://github.com/wandb/wandb-examples/tree/master/experimental/multiprocess
• [ ] ...

Testing

How was this PR tested?

[codecov[bot]]

Codecov Report

Merging #2231 (4c41129) into main (4d039a4) will decrease coverage by 0.07%. The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2231      +/-   ##
==========================================
- Coverage   78.27%   78.20%   -0.08%     
==========================================
  Files         243      243              
  Lines       32381    32381              
==========================================
- Hits        25345    25322      -23     
- Misses       7036     7059      +23     

Impacted Files	Coverage Δ
wandb/compat/tempfile.py	72.72% <0.00%> (-4.55%)	:arrow_down:
wandb/sdk/wandb_init.py	87.03% <0.00%> (-4.24%)	:arrow_down:
wandb/integration/keras/keras.py	60.63% <0.00%> (-2.04%)	:arrow_down:
wandb/sdk/interface/interface.py	89.78% <0.00%> (-0.54%)	:arrow_down:
wandb/sdk/lib/git.py	72.93% <0.00%> (ø)
wandb/sdk/wandb_settings.py	91.05% <0.00%> (+0.31%)	:arrow_up:
wandb/sdk/internal/meta.py	81.36% <0.00%> (+3.10%)	:arrow_up:

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