renamed asObservable() to toObs()

[subzero911]

Hello.
I was thinking about .asObservable(), it looks clumsy. It's not funny to write 1.asObservable() (and no big difference with Observable(1)).
Also, as looks like a cast, but actually it's a wrapping a value into Observable() (or creating an ObservableList from List).
I wanted a shorter and meaningful name. In GetX there's an .obs getter, but a line var x = 1.obs; is not obvious.
So I've chosen toObs(), it has the most native feel (like .toList())

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[codecov]

Codecov Report

Merging #826 (34d8b01) into master (726025a) will increase coverage by 1.18%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master      #826      +/-   ##
===========================================
+ Coverage   98.81%   100.00%   +1.18%     
===========================================
  Files          56         5      -51     
  Lines        1933        97    -1836     
===========================================
- Hits         1910        97    -1813     
+ Misses         23         0      -23     

Flag	Coverage Δ
flutter_mobx	100.00% <ø> (ø)
mobx	?
mobx_codegen	?

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Impacted Files	Coverage Δ
...rc/api/extensions/observable_future_extension.dart
.../src/api/extensions/observable_list_extension.dart
...b/src/api/extensions/observable_map_extension.dart
...b/src/api/extensions/observable_set_extension.dart
...src/api/extensions/primitive_types_extensions.dart
mobx/lib/src/core/context_extensions.dart
mobx/lib/src/core/atom_extensions.dart
mobx/lib/src/api/annotations.dart
mobx_codegen/lib/src/template/observable.dart
mobx_codegen/lib/src/template/computed.dart
... and 40 more

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