Add Datadog service definition to register applications in the Service Catalog

This PR Creates a `service.datadog.yaml` file, which will automatically register this repository and its deployments with the [Datadog Service Catalog](https://app.datadoghq.com/services?env=development&hostGroup=&lens=Ownership). This file is created using the data gathered during our last RAU day.

Information that gets tied to Datadog includes team name and a link to their slack channel. APIs with docs in the Developer Portal will also have an included link.

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## 📣 Required Action

🎉 All of the information in this PR is valid. Please approve and merge this PR!

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[Link to Notion Blog Post](https://www.notion.so/figuretech/The-Datadog-Service-Catalog-40684e63a81c4293beba7f90f5bc9c4b?pvs=4)

Please see [this shortcut ticket](https://app.shortcut.com/figure/story/208641/create-script-to-correlate-rau-notion-data-with-github-deployment-data?ct_workflow=all&cf_workflow=500089005) for more information.

[sc-208917]

Author: ahatzz11

service.datadog.yaml

@@ -0,0 +1,14 @@
+schema-version: v2
+dd-service: forge.pb
+team: team-rd
+contacts:
+- type: slack
+  contact: https://figure-group.slack.com/archives/C024YJBBBU0
+repos:
+- name: GitHub Repo
+  provider: github
+  url: https://github.com/FigureTechnologies/forge.pb
+docs:
+- name: GitHub Team
+  provider: github
+  url: https://github.com/orgs/FigureTechnologies/teams/team-rd/members