feat: New quickstart for aws app signals

[jcountsNR]

Summary

New Quickstart based on AWS Application Signals. PR's are pending for entity's and documentation, but data is available today in AWS.

Pre merge checklist

• [x] Did you check you NRQL syntax? - Does it work?
• [x] Did you include a Data source and Documentation reference?
• [ ] Are all documentation links publicly accessible?
• [x] Did you check your descriptive content for voice and tone?
• [x] Did you check your descriptive content for spelling and grammar errors?
• [ ] Did you review your content with a subject matter expert? (e.g. a Browser agent quickstart is reviewed with a member of the Browser Agent team)

Dashboards

• [x] Does the PR contain a screenshot for each of your dashboards?
• [x] Do your screenshots show data?
• [x] Has the sanitization script been run on each dashboard?

Alerts

• [x] Did you check that your alerts actually work?