Visualise experiment dependencies with Mermaid

[ben-denham]

Add a function that accepts a list of tasks and generates a Mermaid class diagram to visualise the task types and dependencies between them.

1. Each task type should be represented as a class with an attribute for each parameter.
2. Each task type that is in a parameter (i.e. a dependency task) should be linked to with an aggregation relationship
   1. The cardinality of the relationship should depend on whether the parameter containing the dependency is a single task or a list/dict containing tasks.
   2. The relationship should be labelled with the parameter field.
3. Add usage of the diagram generation to the readme, tutorial, and cookbook.

[ben-denham]

Added in 83e492a46