fix: add parent-child relationship support for createWorkItem

[Tiberriver256]

This pull request introduces the ability to create a child work item with a parent-child relationship in the Azure DevOps integration. The changes span multiple files and add support for specifying a parent work item when creating a new work item.

The most important changes include:

Integration Test Enhancement:

• Added a new test case to src/features/work-items/create-work-item/feature.spec.int.ts to verify the creation of a child work item with a parent-child relationship. This test ensures that the relationship is correctly established and validated.

Feature Implementation:

• Modified createWorkItem function in src/features/work-items/create-work-item/feature.ts to handle the addition of a parent relationship if a parentId is provided in the options.

Schema Update:

• Updated CreateWorkItemSchema in src/features/work-items/schemas.ts to include an optional parentId field for specifying the ID of the parent work item.

Type Definition:

• Added parentId to the CreateWorkItemOptions interface in src/features/work-items/types.ts to support the new functionality.

Server Configuration:

• Updated createAzureDevOpsServer function in src/server.ts to pass the parentId argument when creating a work item.

#34