fix: `LiveQueryClient.resubscribe` with Parse Server 7 causes many open connections

[dplewis]

Pull Request

• Report security issues confidentially.
• Any contribution is under this license.
• Link this pull request to an issue.

Issue

The fields attribute was changed to keys in Parse Server 7, watch was added in version 6. Resubscribing doesn't subscribe to the same query as the initial subscription. It was discovered that resubscribing with fields on version 7 will caused resubscribing every second which lead to many connections to the server ultimately resulting in a crash.

Closes: https://github.com/parse-community/Parse-SDK-JS/issues/2180

Approach

• Add keys and watch to resubscribe
• Fix the delay interval between resubscriptions

Tasks

• [x] Add tests
• [x] Add changes to documentation (guides, repository pages, code comments)

[parse-github-assistant[bot]]

Thanks for opening this pull request!

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (d76328c) to head (46a7718). Report is 2 commits behind head on alpha.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## alpha #2184 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 64 64 Lines 6364 6365 +1 Branches 1535 1506 -29 ========================================= + Hits 6364 6365 +1 ```

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[mtrezza]

@dplewis changed PR title to describe the issue; is the new title ok?

[dplewis]

The title is perfect!

[parseplatformorg]

🎉 This change has been released in version 5.2.0-alpha.3

[parseplatformorg]

🎉 This change has been released in version 5.2.0-beta.1

[parseplatformorg]

🎉 This change has been released in version 5.2.0