Progressr and future_lapply

[mayer79]

Will keep it open, but not merge yet

This PR brings to changes that were very high up in the candidates for release 1.0.0:

• Use modern parallel computing: future.apply::future_lapply(): To use {kernelshap()} in parallel mode, the user now can simply run plan(...). No other changes are necessary. Compared to the old approach (foreach), packages like {ranger} etc seem to be correctly moved into the corresponding environments. This did not work before because the need for these packages are masked by stats::predict().
• The old progress bar has been replaced by {progressr}. To activate, the user has to set, e.g., `progressr::handlers(global = TRUE) or some more fancy progress bar. What is really neat: this even works in parallel mode. I have added the package as suggested package to not increase the dependency footprint.

@pbiecek
@dswatson

Let me know if you see some other important stuff for version 1.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 97.40260% with 2 lines in your changes missing coverage. Please review.

Project coverage is 96.40%. Comparing base (61e82e4) to head (faef166).

Files with missing lines	Patch %	Lines
R/utils_kernelshap.R	87.50%	1 Missing ⚠️
R/utils_permshap.R	83.33%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #173      +/-   ##
==========================================
- Coverage   96.71%   96.40%   -0.31%     
==========================================
  Files           7        7              
  Lines         669      668       -1     
==========================================
- Hits          647      644       -3     
- Misses         22       24       +2     

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[pbiecek]

Wow, both extensions are a great

A minor drawback is the additional dependencies, but these packages are fairly safe and should not cause any problems in the future.

looking forward version 1.0 on CRAN 🎉🎉🎉

[mayer79]

I am not yet 100% convinced of future_lapply/progressr. So I am tending to release 0.9 without this PR, then take sometime to gain more experience with it, and then eventually go for 1.0.0.