Add initial pool and swimlane implementation

[matthiaslehnertum]

This PR intends to add support for pools and swimlanes to the BPMN diagram type.

Checklist

• [x] I documented the TypeScript code using JSDoc style.
• [x] I added multiple screenshots/screencasts of my UI changes
• [x] I translated all the newly inserted strings into German and English

Motivation and Context

Pools are swimlanes are central components of the BPMN standard, allowing to model activities of different operators and their exchanges.

Description

Pools are added to the BPMN diagram type as a new entity type with the ability to add swimlane within it.

Steps for Testing

1. Select the BPMN diagram type
2. Drop a pool element onto the canvas
3. Double click on the pool element
4. Add a few swimlanes
5. Try resizing the swimlanes
6. Add elements within the swimlanes and connect them
7. Delete one of the swimlanes

Test Coverage

File	% Stmts	% Branch	% Funcs	% Lines
main/packages/bpmn/bpmn-pool	49.58	100	40	49.58
bpmn-pool-component.tsx	100	100	100	100
bpmn-pool-update.tsx	38.4	100	0	38.4
bpmn-pool.ts	40.32	100	50	40.32
main/packages/bpmn/bpmn-swimlane	89.65	100	66.66	89.65
bpmn-swimlane-component.tsx	100	100	100	100
bpmn-swimlane.ts	81.81	100	50	81.81

Screenshots

Example of a BPMN diagram with a pool with multiple swimlanes

Example of the update dialog of the pool that allows inserting additional swimlanes

[matthiaslehnertum]

@loreanvictor I would merge the Groups PR first - that one fixes the disassociation issue for the pools and swimlanes as well