feat: Bom item field calculation

[jens-kuerten]

Adds event for field calculation on BOM Items.
Also adds missing custom attributes on BOM Items, because those are the attributes you would usually want to do calculations on.

[Copilot]

Pull request overview

This PR adds support for field calculation events on BOM (Bill of Materials) items, enabling custom field calculations when BOM items are created, modified, copied, or indexed. The implementation includes extensive custom attribute support (120 custom fields across char, bigchar, integer, float, boolean, and date types) to allow users to perform calculations on BOM item data.

• Introduces a new BOMItemFieldCalculationEvent that follows the same pattern as the existing PartFieldCalculationEvent
• Adds 120 custom attribute fields to the BOMItem class (20 fields each for char, bigchar, integer, float, boolean, and date types)
• Updates the get_items_of_type utility function to support finding single object instances in addition to lists

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
json_schemas/request.json	Adds JSON schema definitions for BOMItem with all standard and custom fields, BOMItemFieldCalculationData, and BOMItemFieldCalculationEvent; updates event discriminator mapping
csfunctions/objects/part.py	Extends BOMItem class with cdb_object_id field, 120 custom attribute fields, part reference field, and link_objects method for establishing object relationships
csfunctions/events/bom_item_field_calculation.py	Defines new BOMItemFieldCalculationEvent and BOMItemFieldCalculationData classes following established event patterns
csfunctions/events/base.py	Adds BOM_ITEM_FIELD_CALCULATION to EventNames enum
csfunctions/events/init.py	Exports new BOMItemFieldCalculationEvent and BOMItemFieldCalculationData classes and includes them in event type unions
csfunctions/util.py	Enhances get_items_of_type function to handle single object instances in addition to lists, required for BOMItem's link_objects method
docs/reference/objects.md	Documents all 120 new custom attribute fields and the part reference field added to BOMItem
docs/reference/events.md	Documents the new BOMItemFieldCalculationEvent with its data structure, action types, and field descriptions

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