QStringList TLC

QStringList has several shortcomings. This epic sketches them. When grooming, please create proper tasks for each item under this epic:

In no particular order:

• the docs show only a subset of functions
  • e.g. indexOf only for QRegularExpression, not for QString, QStringView, QLatin1StringView (which partly come in via the indexOf template function, but it looks odd nonetheless)
  • doc fixes should be backported to current LTS, at least, so may need a Q_QDOC-block to fake them before actually implementing them (which is for dev only, because it adds new symbols)
• the following functions are missing (some) overloads (join and contains are considered complete, for now):
  • indexOf/lastIndexOf
    • they work because they have a template backend, but fact this is visible in Clang -ftime-trace (→ QTBUG-97601), so they should get the same treatment as contains (out-of-line QStringList_xxx functions
  • filter() (QL1SV)
• replaceInStrings() should be QAnyStringView-ified (two arguments = too many overloads)
• the following functions could do with a CaseSensitivity argument:
  • indexOf/lastIndexOf (cf. contains())
    • must take care where to place it w.r.t. the from parameter
  • removeDuplicates()?