Inbox unread filter fixes #2317

[andreymikhadyuk]

• PR title equals to the ticket name
• I added the ticket to the Development section of this PR.

What was changed?

• added getQueryParam util
• added changes to the inbox cacheing
  • on cache hydration now we clear inbox items, so we will store inbox items only when unread !== true
  • if cached inbox's unread flag is not equal to the flag of the loading page, then we clear inbox on dehydration of the cache
• fixed fetching of the chat channels in the cache middle to only fetch channels with messageCount > 0

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