Diagram dialect

Origin common/engineering/engineering.yml 26:5
Uri engineering://nasdanika/modules/core/modules/common/issues/diagram-dialect
Target Common
Workable
And also extensible dialects via services - use Java services to find DiagramGenerator service for a dialect. Get rid of enum in favor dialect name discovery via services. One of dialect providers - org.nasdanika.diagram.gen - reads the fenced block as diagram YAML load spec. Generates PlantUML, Drawio, etc. Possible advantages - ease of switch between generation targets, one spec to learn, higher level of abstraction, ability to define drawio diagrams in text. Disadvantages - may be more verbose and may not provide all the features of the underlying diagramming engine.