Open source internal implementation

[kononovk]

Purpose

• First implementation of all asynchronous primitives.
• Add tests, examples
• Fix CI
• Changes in README (add badges and useful links)

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: ...

[github-actions]

Pull Request Test Coverage Report for Build 5099995144

• 65 of 75 (86.67%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-13.9%) to 86.111%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
include/ione/context.hpp	21	23	91.3%
src/context.cpp	33	41	80.49%

Totals
Change from base Build 5009095869:	-13.9%
Covered Lines:	113
Relevant Lines:	124

---

💛 - Coveralls

[codecov]

Codecov Report

Merging #5 (0b6fd09) into main (8a92d55) will decrease coverage by 13.34%.
The diff coverage is 86.66%.

@@             Coverage Diff              @@
##              main       #5       +/-   ##
============================================
- Coverage   100.00%   86.66%   -13.34%     
============================================
  Files            1        3        +2     
  Lines            2       75       +73     
============================================
+ Hits             2       65       +63     
- Misses           0       10       +10     

Impacted Files	Coverage Δ
src/context.cpp	80.48% <80.48%> (ø)
include/ione/context.hpp	91.30% <91.30%> (ø)
include/ione/async/timeout.hpp	100.00% <100.00%> (ø)

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