add RP API More Secure Defaults Guidance

[Stefan0Anghel]

This PR adds documentation for the RP API More Secure Defaults API writing guidance. It provides clear recommendations on how to structure and implement secure defaults within RP APIs to enhance security and consistency.

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[MushMal]

Provided minor comments.

[MushMal]

Rename to a more presentable display name instead of RP-API-MSD?

[JeffreyRichter]

Why do RP-specific guidelines go in the data-plane guidelines?
Maybe we want to adopt this for data-plane; I haven't reviewed this PR enough to know.

[MushMal]

RP -> ARM Resource Provider?

Something like: "### ARM Resource Provider More Secure Default Parameter Guidance"

[mikekistler]

This is not the right document for ARM API guidelines.

[MushMal]

...either more secure default parameter values or making the previously optional parameter as required"

[johanste]

Defaulting vs. explicitness is a difficult trade-off.

Default values allow the service to improve its security posture over time with new capabilities without forcing clients to change. Having clients explicitly "pin" values can slow down adoption of new capabilities. Adding new required parameters means breaking changes. Which slows down adoption of new api versions. Which in turn slows down the ability to use the new features.

In practical terms, we need to have a default value for new security related properties when we migrate previously existing resources. That doesn't have to mean that we use the same default values in the public api definitions, but it doesn't seem like an unreasonable thing to do either.

[MushMal]

...as "required", especially if security-sensitive.

[MushMal]

...define a default value which is deemed as more secure

[MushMal]

• Providing a concise but descriptive description of the parameters in the API

[johanste]

To expand on this (and why it is important for services to not make assumptions about this value) - client request id is often used to group a set of "logical" client requests. Retries will use the same client request id. I believe that tools like the azure cli may use the same client request id for each request made in a single command execution.

[mikekistler]

What is a "security parameter"?