NGINX: Migrate auth cache key to NJS.

[elizabeth-dev]

What this PR does / why we need it:

Migrate the Lua scripting code for calculating the auth cache key to NJS, maintaining the same behavior.

Depends on #12345 (change starts from that branch)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• CVE Report (Scanner found CVE and adding report)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation only

Which issue/s this PR fixes

Part of #12383

How Has This Been Tested?

The new implementation has been tested manually to verify that the result it produces matches the one in Lua, as well as passing the e2e test suite

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have added unit and/or e2e tests to cover my changes.
• All new and existing tests passed.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: elizabeth-dev
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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @elizabeth-dev. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[longwuyuan]

@elizabeth-dev , you may want to look at this #12345 (comment) and adjust accordingly here