Add WikiProject and WikiProject_talk namespace and its aliases
for zh.wikipedia

Based on community request, create WikiProject namespace on zh.wikipedia.

Adding WikiProject namespace and its talk
page(WikiProject_talk namespace) to zh.wikipedia.

This also add aliases of WikiProject and WikiProject_talk for zh.wikipedia.

Bug: T271612
Change-Id: Iba3aa3e5ab4485ceecc1e61458c61831d2c04d18