Towards a 1.0.0 release

[ablaom]

To be merged onto the source branch of this PR (for-a-0-point-22-release) before merging this PR onto dev:

• Replace built-in measures with measures in StatisticalMeasures.jl #909
• Remove deprecated code supporting @from_network and @pipeline. #932
• Remove target as alias for transformer in TransformedTargetModel #933
• Improve test coverage #934

[codecov-commenter]

Codecov Report

Patch coverage: 95.91% and project coverage change: -0.62% ⚠️

Comparison is base (e49c5df) 87.81% compared to head (7ed7d17) 87.19%.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #908      +/-   ##
==========================================
- Coverage   87.81%   87.19%   -0.62%     
==========================================
  Files          40       27      -13     
  Lines        3660     2523    -1137     
==========================================
- Hits         3214     2200    -1014     
+ Misses        446      323     -123     

Files Changed	Coverage Δ
src/MLJBase.jl	100.00% <ø> (ø)
src/composition/learning_networks/replace.jl	98.63% <ø> (+3.69%)	⬆️
src/composition/models/pipelines.jl	100.00% <ø> (+2.73%)	⬆️
src/composition/models/transformed_target_model.jl	100.00% <ø> (ø)
src/machines.jl	90.45% <ø> (ø)
ext/DefaultMeasuresExt.jl	66.66% <66.66%> (ø)
src/composition/models/stacking.jl	94.82% <88.88%> (-0.50%)	⬇️
src/resampling.jl	91.86% <98.43%> (+0.36%)	⬆️
src/default_measures.jl	100.00% <100.00%> (ø)
src/operations.jl	90.38% <100.00%> (+0.38%)	⬆️
... and 1 more

... and 1 file with indirect coverage changes

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