Define ServiceScopeConfig in ServiceSettings (#3464)

* Define ServiceScopeConfig in ServiceSettings

Signed-off-by: Jackie Elliott <jaellio@microsoft.com>

* Add release note

Signed-off-by: Jackie Elliott <jaellio@microsoft.com>

* remove suffix

Signed-off-by: Jackie Elliott <jaellio@microsoft.com>

* add back missing scope from example

Signed-off-by: Jackie Elliott <jaellio@microsoft.com>

* Remove nested list

Signed-off-by: Jackie Elliott <jaellio@microsoft.com>

* make gen

Signed-off-by: Jackie Elliott <jaellio@microsoft.com>

* Update example

Signed-off-by: Jackie Elliott <jaellio@microsoft.com>

* make gen

Signed-off-by: Jackie Elliott <jaellio@microsoft.com>

* Update gen

Signed-off-by: Jackie Elliott <jaellio@microsoft.com>

* Clarify example

Signed-off-by: Jackie Elliott <jaellio@microsoft.com>

* Clarify behavior of servicescopeconfig

Signed-off-by: Jackie Elliott <jaellio@microsoft.com>

* Respond to PR feedback about docs

Signed-off-by: Jackie Elliott <jaellio@microsoft.com>

* Move ServiceScopeConfigs to its own message. Define relationship
between ServiceSettings and ServiceScopeConfigs.

Signed-off-by: Jackie Elliott <jaellio@microsoft.com>

* Clarify declaritive intent

Signed-off-by: Jackie Elliott <jaellio@microsoft.com>

* Clarify API intent for mesh admin

Signed-off-by: Jackie Elliott <jaellio@microsoft.com>

* Fix example

Signed-off-by: Jackie Elliott <jaellio@microsoft.com>

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Signed-off-by: Jackie Elliott <jaellio@microsoft.com>

Author: jaellio