Add save() and load() methods to MetaResult objects

[JulioAPeraza]

Closes #770.

Changes proposed in this pull request:

• Pass NiMAREBase to MetaResult class to be able to save and load MetaResult objects.

[codecov]

Codecov Report

Base: 88.66% // Head: 88.65% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (4703d5e) compared to base (87964b8).
Patch coverage: 89.47% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #771      +/-   ##
==========================================
- Coverage   88.66%   88.65%   -0.02%     
==========================================
  Files          38       39       +1     
  Lines        4323     4327       +4     
==========================================
+ Hits         3833     3836       +3     
- Misses        490      491       +1     

Impacted Files	Coverage Δ
nimare/estimator.py	86.66% <86.66%> (ø)
nimare/base.py	84.52% <100.00%> (-0.30%)	⬇️
nimare/meta/cbma/base.py	96.01% <100.00%> (ø)
nimare/meta/ibma.py	99.50% <100.00%> (ø)
nimare/results.py	69.23% <100.00%> (+0.48%)	⬆️
nimare/transforms.py	75.36% <100.00%> (-0.28%)	⬇️

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[jdkent]

LGTM, but does get_params still work with a MetaResult object?

[JulioAPeraza]

I think MetaResult.get_params() gives the parameter of the estimator (as a nested object) in the format <component>__<parameter>, and the mask, maps, and tables from a MetaResult object.
Are those the expected outputs?

[jdkent]

LGTM!

[tsalo]

Love this change, but can you add the new methods to one of the tests?

[JulioAPeraza]

Thanks! I've added the test to test_meta_ale after the saving/loading method of the estimator is tested.

[jdkent]

this looks good to merge.