feat: add DataBillingMeter and DataAggregateLimitCounter node types

[pyramation]

Summary

Adds two new node type definitions to packages/node-type-registry for billing and aggregate limit tracking:

• DataBillingMeter — Declares a billing usage-recording trigger on a table. Calls record_usage on INSERT (increment), DELETE (reversal), and optionally UPDATE (transfer when entity_field changes). Required param: meter_slug.

• DataAggregateLimitCounter — Declares per-entity (org-level) aggregate limit triggers via org_limit_aggregates_inc/dec, complementing the existing per-user DataLimitCounter. Required param: limit_name.

Both follow the existing NodeTypeDefinition pattern and are exported from src/data/index.ts.

The corresponding SQL generators live in constructive-io/constructive-db:

• DataAggregateLimitCounter generator — merged via PR feat(presigned-url): add per-bucket mutation entry points on root Mutation type #1071
• DataBillingMeter generator — in PR feat(presigned-url): enforce bulk upload limits (maxBulkFiles + maxBulkTotalSize) #1081 (billing metering phase 1)

Review & Testing Checklist for Human

• Verify DataBillingMeter.parameter_schema matches the parameters consumed by the data_billing_meter generator in constructive-db (meter_slug, entity_field, quantity, events)
• Verify DataAggregateLimitCounter.parameter_schema matches the data_aggregate_limit_counter generator (limit_name, entity_field, events)
• Confirm the description text accurately reflects runtime behavior for both nodes

Notes

• These are static type definitions only — no runtime code. The actual trigger generation logic lives in metaschema-generators in constructive-db.
• DataBillingMeter includes a quantity param (default 1) that DataAggregateLimitCounter does not, mirroring the difference between billing (variable units) and limits (always ±1). This matches the generator implementations.

Link to Devin session: https://app.devin.ai/sessions/6e29559e7a5d4074810f0bd0273dcfc3
Requested by: @pyramation

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