feat(projections): resource counters (#9979)

# Which Problems Are Solved

Add the ability to keep track of the current counts of projection
resources. We want to prevent calling `SELECT COUNT(*)` on tables, as
that forces a full scan and sudden spikes of DB resource uses.

# How the Problems Are Solved

- A resource_counts table is added
- Triggers that increment and decrement the counted values on inserts
and deletes
- Triggers that delete all counts of a table when the source table is
TRUNCATEd. This is not in the business logic, but prevents wrong counts
in case someone want to force a re-projection.
- Triggers that delete all counts if the parent resource is deleted
- Script to pre-populate the resource_counts table when a new source
table is added.

The triggers are reusable for any type of resource, in case we choose to
add more in the future.
Counts are aggregated by a given parent. Currently only `instance` and
`organization` are defined as possible parent. This can later be
extended to other types, such as `project`, should the need arise.

I deliberately chose to use `parent_id` to distinguish from the
de-factor `resource_owner` which is usually an organization ID. For
example:

- For users the parent is an organization and the `parent_id` matches
`resource_owner`.
- For organizations the parent is an instance, but the `resource_owner`
is the `org_id`. In this case the `parent_id` is the `instance_id`.
- Applications would have a similar problem, where the parent is a
project, but the `resource_owner` is the `org_id`


# Additional Context

Closes https://github.com/zitadel/zitadel/issues/9957

cmd/setup/setup.go

@@ -215,6 +215,7 @@ func Setup(ctx context.Context, config *Config, steps *Steps, masterKey string)
 	steps.s54InstancePositionIndex = &InstancePositionIndex{dbClient: dbClient}
 	steps.s55ExecutionHandlerStart = &ExecutionHandlerStart{dbClient: dbClient}
 	steps.s56IDPTemplate6SAMLFederatedLogout = &IDPTemplate6SAMLFederatedLogout{dbClient: dbClient}
+	steps.s57CreateResourceCounts = &CreateResourceCounts{dbClient: dbClient}
 
 	err = projection.Create(ctx, dbClient, eventstoreClient, config.Projections, nil, nil, nil)
 	logging.OnError(err).Fatal("unable to start projections")
@@ -260,6 +261,7 @@ func Setup(ctx context.Context, config *Config, steps *Steps, masterKey string)
 		steps.s54InstancePositionIndex,
 		steps.s55ExecutionHandlerStart,
 		steps.s56IDPTemplate6SAMLFederatedLogout,
+		steps.s57CreateResourceCounts,
 	} {
 		setupErr = executeMigration(ctx, eventstoreClient, step, "migration failed")
 		if setupErr != nil {
@@ -296,6 +298,7 @@ func Setup(ctx context.Context, config *Config, steps *Steps, masterKey string)
 			client: dbClient,
 		},
 	}
+	repeatableSteps = append(repeatableSteps, triggerSteps(dbClient)...)
 
 	for _, repeatableStep := range repeatableSteps {
 		setupErr = executeMigration(ctx, eventstoreClient, repeatableStep, "unable to migrate repeatable step")