Integrate V4 QB

[nityanandagohain]

Follow up of #5912 . This PR contains changes of #5912 as well. So please review it first before coming to this PR.

For issue #5555

Here the different API's are configured to use the new schema in a feature flag.

• GetLogFields() use the new table if flag is enabled.
• UpdateLogField() uses the new table if flag is enabled ( selected field api)
• GetLogAggregateAttributes() uses the new table if flag is enabled.
• GetLogAttributeKeys() uses the new table if flag is enabled.
• GetLogAttributeValues() uses the new table if flag is enabled.
• LiveTailLogsV4() is used if flag is enabled else LiveTailV3
• Query Builder options is moved to model.

[srikanthccv]

Whereever there are big functions, can you make a v2 version of it and call it at the start of call chain instead of if use { a lot new schema code} else {lot of old code}

• It will be easier to follow the changes in PR because you won't touch old code
• it will be easier to delete when the v2 rollout is complete

[nityanandagohain]

Thanks for the feedback, it makes sense. Let me do that.