Add missing ECS docs

[happyRip]

Summary

Ref #1385
Ref https://github.com/TheThingsIndustries/lorawan-stack-support/issues/1132

Screenshots

Changes

• Update TimescaleDB section.
• Add SQS queue section.
• Add TRM section.

Notes for Reviewers

nil

Checklist

• Scope: The referenced issue is addressed, there are no unrelated changes.
• Run Locally: Verified that the docs build using make server, posted screenshots, verified external links. Test with HUGO_PARAMS_SEARCH_ENABLED=true if style changes will affect the search bar.
• New Features Marked: Documentation for new features is marked using the new-in-version shortcode, according to the guidelines in CONTRIBUTING.
• Style Guidelines: Documentation obeys style guidelines in CONTRIBUTING.
• Commits: Commit messages follow guidelines in CONTRIBUTING, there are no fixup commits left.