Provides information about available task types. A task is a unit of work that has to be
scheduled within a certain time window and requires at least one employee. If multiple employees are
required to complete a task, it is assumed that they have to work on it at the same time. Similarly,
it is not possible to split work on a task across multiple employees (e.g. employee A works the first
30 minutes of a 1 hour task and employee B the second 30 minutes). Employees assigned to a task have to
be present for the whole length of the task (if it is split into multiple parts, the same employees
have to work on each part).