Treat unstable versions with tilde specially

[fredden]

This pull request changes the normalisation rules for tilde (~) version ranges to cope with unstable / pre-1.0 version numbers.

For example, compare the selected versions on these two URLs:

• https://semver.madewithlove.com/?package=psr%2Fhttp-message&constraint=~0.1
• https://semver.madewithlove.com/?package=psr%2Fhttp-message&constraint=%5E0.1

Fixes ergebnis/composer-normalize#1473
Fixes ergebnis/composer-normalize#1584

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.43%. Comparing base (186141e) to head (f745842).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1247      +/-   ##
============================================
+ Coverage     97.40%   97.43%   +0.02%     
  Complexity      216      216              
============================================
  Files            32       32              
  Lines           810      818       +8     
============================================
+ Hits            789      797       +8     
  Misses           21       21              

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