Add support for Mermaid diagram syntax for "Create Dependency Graph" command

[sergeyol]

Mermaid diagrams are very similar in syntax to GraphViz (so it would be fast to implement), and are supported out-of-the-box by Github and Azure Devops markdown engines.

Here is an example of a syntax:

flowchart TD;
LIB[Library App]
APP1[App 1]
APP2[App 2]

LIB --> APP1
LIB --> APP2