[CHAT-976] queryMembers

[thesyncim]

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introduce a new endpoint that allows clients to filter and search channel members

example queries:

query all the members for the current channel where user.name='tommaso'

channel.queryMembers({'name':'tommaso'})

filter member by id

channel.queryMembers({'id':'tommaso'})

query all the members for the current channel where user.name contains

channel.queryMembers({'name':{"$q":'tomm'}})

query channel moderators

channel.queryMembers({'is_moderator:true'})

query for banned members in channel

channel.queryMembers({'banned:true'})

[vishalnarkhede]

LGTM