Add identity to cosmosdb-preview extension

[zehende]

Support for the 'identity' group of commands in Cosmos DB:

• az cosmosdb identity show
• az cosmosdb identity assign
• as cosmosdb identity remove

Examples:

Assign an existing user identity to a cosmos db account az cosmosdb identity assign -g myrg -n mycdbact --identities /subscriptions/00000000-0000-0000-00000000/resourcegroups/MyRG/providers/Microsoft.ManagedIdentity/userAssignedIdentities/MyID

Remove a user identity from a cosmos db account az cosmosdb identity remove -g myrg -n mycdbact --identities /subscriptions/00000000-0000-0000-00000000/resourcegroups/MyRG/providers/Microsoft.ManagedIdentity/userAssignedIdentities/MyID

Add system managed identity and user identity to a cosmos db account az cosmosdb identity assign -g myrg -n mycdbact --identities [system] /subscriptions/00000000-0000-0000-00000000/resourcegroups/MyRG/providers/Microsoft.ManagedIdentity/userAssignedIdentities/MyID

Update the default identity to user identity az cosmosdb update -g myrg -n mycdbact ... --default-identity UserAssignedIdentity=/subscriptions/00000000-0000-0000-00000000/resourcegroups/MyRG/providers/Microsoft.ManagedIdentity/userAssignedIdentities/MyID

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[yonzhan]

cosmosdb

[evelyn-ys]

Why do we need this since this has been added in CLI main repo https://github.com/Azure/azure-cli/pull/19533?