[doc] add a minimal documentation for OPA RLS capabilities

[harksin]

Description

Add missing docs for OPA security plugin

Release notes

(x) This is not user-visible or is docs only, and no release notes are required. ( ) Release notes are required. Please propose a release note for me. ( ) Release notes are required, with the following suggested text:

# Section
* Fix some things. ({issue}`issuenumber`)

[cla-bot[bot]]

Thank you for your pull request and welcome to our community. We could not parse the GitHub identity of the following contributors: roch. This is most likely caused by a git client misconfiguration; please make sure to:

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[mosabua]

Please submit a signed CLA and wrap all paragraphs at 80 columns width. Then we can review in detail

[cla-bot[bot]]

Thank you for your pull request and welcome to the Trino community. We require contributors to sign our Contributor License Agreement, and we don't seem to have you on file. Continue to work with us on the review and improvements in this PR, and submit the signed CLA to [email protected]. Photos, scans, or digitally-signed PDF files are all suitable. Processing may take a few days. The CLA needs to be on file before we merge your changes. For more information, see https://github.com/trinodb/cla

[cla-bot[bot]]

Thank you for your pull request and welcome to the Trino community. We require contributors to sign our Contributor License Agreement, and we don't seem to have you on file. Continue to work with us on the review and improvements in this PR, and submit the signed CLA to [email protected]. Photos, scans, or digitally-signed PDF files are all suitable. Processing may take a few days. The CLA needs to be on file before we merge your changes. For more information, see https://github.com/trinodb/cla

[harksin]

Please submit a signed CLA and wrap all paragraphs at 80 columns width. Then we can review in detail

thanks for the advice, it's done

[cla-bot[bot]]

Thank you for your pull request and welcome to the Trino community. We require contributors to sign our Contributor License Agreement, and we don't seem to have you on file. Continue to work with us on the review and improvements in this PR, and submit the signed CLA to [email protected]. Photos, scans, or digitally-signed PDF files are all suitable. Processing may take a few days. The CLA needs to be on file before we merge your changes. For more information, see https://github.com/trinodb/cla

[mosabua]

Can you address the feedback and suggestions @harksin ?

[mosabua]

@cla-bot check

[cla-bot[bot]]

The cla-bot has been summoned, and re-checked this pull request!

[harksin]

Can you address the feedback and suggestions @harksin ?

Hello mosabua, will do it np, but realy busy these days, it will be beg of august probably. If you wanna rollout this erlier,feel free to take the hand on this PR

have a great day,

[mosabua]

Further comments addressed in replacement PR. I will close this PR and merge the replacement. When you are available to work on this again @harksin, feel free to send further PRs to add more details and pull myself and @vagaerg in for help.