Add method signatures for MemcachePool (part of Memcache extension) #46
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It seems like a new class
MemcachePoolgot introduced with version 3 of theMemcacheextension. I didn't dig deeper but I assume it's some kind of wrapper. Tested with versions 3.0.8 and 4.0.4.I did not remove the old definitions, because I am not sure whether older versions of the extension would still work without them.
Fixes phpstan/phpstan#2697