feat: add stable only modifier to describe, it and test methods

[wellwelwel]

Officially introduces the .only method by unifying --only flag and analyze tests in real time when using the .only modifier.

Now .only modifier follows a consistent approach as is common in most test runners, even without the need to map the tests 🎉

• Creativity is sometimes the best strategy 🐷

---

Related:

• feat: add only modifier to describe, it and test methods (experimental) #767
• Version 3.0.0 (planned breaking changes and architecture improvements) #801

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.93%. Comparing base (720616b) to head (7c90894).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #901      +/-   ##
==========================================
+ Coverage   98.51%   98.93%   +0.41%     
==========================================
  Files          35       36       +1     
  Lines        1752     1777      +25     
  Branches       17       11       -6     
==========================================
+ Hits         1726     1758      +32     
+ Misses         11       10       -1     
+ Partials       15        9       -6     

Flag	Coverage Δ
linux	98.81% <100.00%> (+0.41%)	⬆️
osx	98.87% <100.00%> (+0.41%)	⬆️
windows	98.81% <100.00%> (+0.41%)	⬆️

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