refactor(retry): extract delay calculation into strategy implementations

[ns-vasilev]

No description provided.

[spacecode-github-bot]

	2 Warnings
⚠️	⚠️ Some source files are missing corresponding test files: RetryIterator → expected test file: RetryIteratorTests.swift ConstantDelayStrategy → expected test file: ConstantDelayStrategyTests.swift ExponentialDelayStrategy → expected test file: ExponentialDelayStrategyTests.swift
⚠️	Public API changed but no documentation updates found

Generated by 🚫 Danger

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.34%. Comparing base (784f9b0) to head (dea9208).
⚠️ Report is 3 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #72      +/-   ##
==========================================
+ Coverage   97.85%   99.34%   +1.50%     
==========================================
  Files          10       13       +3     
  Lines         650      610      -40     
==========================================
- Hits          636      606      -30     
+ Misses         14        4      -10     

Files with missing lines	Coverage Δ
...Typhoon/Classes/Extensions/Double+SafeUInt64.swift	100.00% <100.00%> (ø)
...Classes/RetrySequence/Iterator/RetryIterator.swift	100.00% <100.00%> (+10.99%)	⬆️
.../Typhoon/Classes/RetrySequence/RetrySequence.swift	100.00% <100.00%> (ø)
...trySequence/Strategies/ConstantDelayStrategy.swift	100.00% <100.00%> (ø)
...Sequence/Strategies/ExponentialDelayStrategy.swift	100.00% <100.00%> (ø)
...Typhoon/Classes/Strategy/RetryPolicyStrategy.swift	100.00% <100.00%> (ø)
...phoonTests/UnitTests/RetryPolicyServiceTests.swift	100.00% <100.00%> (ø)
...hoonTests/UnitTests/RetryPolicyStrategyTests.swift	100.00% <ø> (ø)
...ts/TyphoonTests/UnitTests/RetrySequenceTests.swift	100.00% <ø> (ø)