DOCS-10140 The datadog-sync-cli tool

[iadjivon]

What does this PR do? What is the motivation?

This creates a documentation for the Datadog cli tool.

Merge instructions

Merge readiness:

• [ ] Ready for merge

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Additional notes

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Preview links (active after the build_preview check completes)

New or renamed files

• https://docs-staging.datadoghq.com/ida.adjivon/DOCS-10140-datadog-sync-cli/account_management/guide/sync-cli

Modified Files

• https://docs-staging.datadoghq.com/ida.adjivon/DOCS-10140-datadog-sync-cli/account_management/guide/

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