Small fixes

[MBkkt]

Purpose

• Remove unnecessary detail::
• Make exception, ready, stopped future and test it
• Some fixes for coverage

Related Information

• Design document: ...
• Bench PR: ...

Testing

• This change is a trivial rework or code cleanup without any test coverage.
• This change is already covered by existing tests.
• This PR adds tests that were used to verify all changes.
• There are tests in an external testing repository: ...

[coveralls]

Pull Request Test Coverage Report for Build 2085314280

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.09%) to 100.0%

---

Totals
Change from base Build 2083091196:	0.09%
Covered Lines:	1069
Relevant Lines:	1069

---

💛 - Coveralls

[codecov]

Codecov Report

Merging #167 (5715388) into main (af2e09c) will increase coverage by 3.53%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #167      +/-   ##
==========================================
+ Coverage   91.69%   95.22%   +3.53%     
==========================================
  Files          50       49       -1     
  Lines        1084     1069      -15     
  Branches      164      125      -39     
==========================================
+ Hits          994     1018      +24     
+ Misses          1        0       -1     
+ Partials       89       51      -38     

Impacted Files	Coverage Δ
include/yaclib/algo/detail/wait_impl.hpp	80.00% <ø> (+8.12%)	⬆️
src/log_error.cpp	100.00% <ø> (ø)
src/log_info.cpp	100.00% <ø> (ø)
include/yaclib/async/future.hpp	100.00% <100.00%> (+14.28%)	⬆️
include/yaclib/util/detail/safe_call.hpp	75.00% <0.00%> (-12.50%)	⬇️
include/yaclib/async/detail/result_core.hpp	96.66% <0.00%> (-0.21%)	⬇️
include/yaclib/async/detail/future_impl.hpp	90.56% <0.00%> (-0.09%)	⬇️
include/yaclib/util/result.hpp	100.00% <0.00%> (ø)
... and 20 more

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