Deprecate LiveQuery `fields` in preference for LiveQuery `keys`

[dblythy]

New Feature / Enhancement Checklist

• I am not disclosing a vulnerability.
• I am not just asking a question.
• I have searched through existing issues.

Current Limitation

Live Query uses a parameter called "fields", where it should be "keys" like the other parts of the server

Feature / Enhancement Description

Refactor LiveQuery to use "keys"

Example Use Case

n/a

Alternatives / Workarounds

n/a

3rd Party References

n/a

[parse-github-assistant]

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[parseplatformorg]

🎉 This change has been released in version 6.0.0-alpha.33

[parseplatformorg]

🎉 This change has been released in version 6.1.0-beta.1

[parseplatformorg]

🎉 This change has been released in version 6.1.0-alpha.1

[parseplatformorg]

🎉 This change has been released in version 6.1.0

[mtrezza]

Note that this breaks the feature in all Parse client SDKs, as they send the fields parameter. They need to be changed to send the keys parameter instead. See for example parse-community/Parse-SDK-JS#2089.