introduce CODEOWNERS, align service names with specs

[alexrashed]

Motivation

In our previous docs repo, we did use a partly auto-generated CODEOWNERS file to assign reviewers for changes to the docs.
This automation is based on the official AWS service abbreviations to associate the services with the files in the repo.
This PR renames some files which did not align to this convention yet (as you can see in this folder in the botocore repo), and then introduces a (mostly) auto-generated CODEOWNERS file.

Changes

• Renames the following files:
  • pca.mdx -> acm-pca.mdx
  • appautoscaling.mdx -> application-autoscaling.mdx
  • iotdata.mdx -> iot-data.mdx
  • msk.mdx -> kafka.mdx
  • cloudwatchlogs.mdx -> logs.mdx
  • elementalmediaconvert.mdx-> mediaconvert.mdx
  • resourcegroups.mdx -> resource-groups.mdx
  • cognito.mdx -> cognito-idp.mdx
  • timestream.mdx-> timestream-query.mdx
• Introduces a new CODEOWNERS file where:
  • @quetzalliwrites and @HarshCasper own each file by default.
  • For each service, docs files are owned by service owners from the team, @quetzalliwrites, and @HarshCasper.

[quetzalliwrites]

Thank you for your proactive work here @alexrashed 🙌🏻 🫶

[quetzalliwrites]

@HarshCasper as we already noted in Slack, let me know if you need my support to fix the broken redirects links issue that is causing the failed build.

[alexrashed]

FYI: Changing the state to draft, since @HarshCasper mentioned that for this PR we first need to fix our redirects first (public/_redirects).
@HarshCasper: As discussed I'll leave this to you, please let me know if there's anything I can do to help.