Add createAll for multiple entities

[elpete]

Closes #62

Issue review

Recommendation: 8/10 — implement. createAll is a natural companion to create when callers need saved entity instances back. It keeps generated keys, casts, timestamps, custom collections, and lifecycle events intact. The tradeoff is deliberate: unlike qb’s bulk insert, this executes one insert per entity, so callers prioritizing throughput over entity behavior should continue using qb insert/upsert operations.

Implementation

• adds BaseEntity.createAll(attributes, ignoreNonExistentAttributes, options)
• creates every item through Quick’s normal public create and save flow
• returns the model’s configured collection type via newCollection
• returns loaded entities with generated primary keys

Test-first evidence

The public API regression initially errored with QuickMissingMethod because createAll did not exist. It now creates two records, returns both loaded entities, and verifies persistence through a separate Quick query.

Validation

• focused CreateSpec: 4 passed, 0 failed, 0 errors
• full Lucee 6 suite: 496 passed, 0 failed, 0 errors, 3 skipped
• box run-script format
• git diff --check

Uses qb@14.0.0-beta.3.