Bump version to v3.2.0

[axunonb]

Enhancements

• Remove usage of Linq for less GC
• Add IConvertable support for PluralLocalizationFormatter and ConditionalFormatter
• ListFormatter
  • ListFormatter handles selector name "Index" in IEnumerables and ILists: In v1.6.1 a Selector was tested for having the name "index", even if data was not an IList, and returned the CollectionIndex. This is now implemented again in the ListFormatter.TryEvaluateSelector(...)
  • Set the ParentPlaceholder property for item Formats
  • Use PooledObject<T> where possible, so objects will be returned to ObjectPool also in case of exceptions

Fixes

• FormatItem.AsSpan() returns the correct name
• Remove potential namespace collisions: All public types in namespace Cysharp.Text are now internal