fix: don't loose extensions of enum values when sorting schemas

[erikwrede]

When sorting a schema lexicographically, the enum values lost their extensions.

[codspeed-hq]

CodSpeed Performance Report

Merging #245 will not alter performance

_{Comparing erikwrede:fix-keep-enum-value-extensions-on-lex-sorting (72e6445) with main (4b0ada2)}

Summary

✅ 14 untouched

[Cito]

Thank you @erikwrede

[Cito]

Actually input values and the schema itself had the same problem, fixed that already, and backported it as well.

[erikwrede]

@Cito still meant to check for that, great you found it first :) thanks for the quick merge