Deprecate current pages implementation

[mtrezza]

New Issue Checklist

• I am not disclosing a vulnerability.
• I am not just asking a question.
• I have searched through existing issues.
• I can reproduce the issue with the latest version of Parse Server.

Issue Description

A new pages router has been introduced with #7128. The PagesRouter has since been thoroughly tested and can be moved out of experimental status.

For Parse Server 5.0-beta, the current router should be deprecated in favor of the new PagesRouter.

Steps to reproduce

n/a

Actual Outcome

n/a

Expected Outcome

n/a

Environment

Server

• Parse Server version: 5.0.0-alpha.1

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[vibh1103]

Hi @mtrezza can i pick this task ?

[mtrezza]

Sure, please feel free. Now would be a good time, so we can merge a PR in November for Parse Server 7 release.

[vibh1103]

@mtrezza can you please share some reference PR's previously we deprecated the feature.

[mtrezza]

You could search for "deprecate" in the merged PRs, to see how a deprecation is done, like #8388.

The contribution guide also has a chapter about it.