implemented str_contains
FunctionTypeSpecifyingExtension
#1067
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first str-family-function to infer
non-empty-string
type.Initially had the idea of putting everything into a single StrFamily* extension, but then figured that the semantics between substr, substring, strpos, stripos, str_contains etc are too different, and it would be more readable to put each of them into a separate extension.
therefore this is the first PR. if merged, I will work on similar semantics for the remaining functions
refs phpstan/phpstan#6792