mobx utils

[altynbek132]

added mobx utils

• obs from Listenable
• obs from ValueNotifier
• Stream of obs values

at least we should have ability to convert obs values into stream since streams are very useful for async world
https://github.com/mobxjs/mobx-utils#tostream
for example we could convert computed field to stream and solve #860

added reporting manual change for observable and collections
there are some cases when you should need to report change, for example if using collections extensions (sortBy), or writing own function that converts some class similar to Listenable.

[codecov]

Codecov Report

Merging #886 (60a3085) into master (13b7e6d) will decrease coverage by 0.77%.
The diff coverage is 0.00%.

❗ Current head 60a3085 differs from pull request most recent head 7193902. Consider uploading reports for the commit 7193902 to get more accurate results

@@            Coverage Diff             @@
##           master     #886      +/-   ##
==========================================
- Coverage   98.96%   98.19%   -0.77%     
==========================================
  Files          55       55              
  Lines        1924     1939      +15     
==========================================
  Hits         1904     1904              
- Misses         20       35      +15     

Flag	Coverage Δ
flutter_mobx	100.00% <ø> (ø)
mobx	97.46% <0.00%> (-1.08%)	⬇️
mobx_codegen	100.00% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...rc/api/observable_collections/observable_list.dart	98.76% <0.00%> (-1.24%)	⬇️
...src/api/observable_collections/observable_map.dart	97.45% <0.00%> (-2.55%)	⬇️
...src/api/observable_collections/observable_set.dart	95.23% <0.00%> (-4.77%)	⬇️
mobx/lib/src/core/observable.dart	89.13% <0.00%> (-10.87%)	⬇️

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[ghenry]

This looks very useful too. Anyone else have review and merge perms?

[altynbek132]

@pavanpodila

[amondnet]

I also implemented some features of mobx-utils.
https://github.com/amondnet/mobx_utils

[pavanpodila]

Coverage has dropped. Can we fix that @amondnet ?