feature #40171 [Workflow] Add Mermaid.js dumper (eFrane)

This PR was squashed before being merged into the 5.3-dev branch.

Discussion
----------

[Workflow] Add Mermaid.js dumper

| Q             | A
| ------------- | ---
| Branch?       | 5.x
| Bug fix?      | no
| New feature?  | yes
| Deprecations? | no
| Tickets       | #40165
| License       | MIT
| Doc PR        | symfony/symfony-docs#15102

Mermaid is - next to PlantUML - one of the most popular simple graphing solutions. This workflow dumper mirrors the feature set of the PlantUML dumper except that Mermaid does not currently support colored transitions.

**Things I need help with:**

- ~I basically tried to copy the code style of the surrounding files and hope everything is conforming. Please let me know if I missed something.~ I see, that's the magic of fabbot. Nice. ❤️
- There are currently no tests for the different graph direction constants, I can add those, just did not see value in doing so yet.
- I am unsure how to integrate this with the current documentation. This however is likely better discussed in the corresponding issue (see above).

Commits
-------

ada6f7d315 [Workflow] Add Mermaid.js dumper

Author: lyrixx

Command/WorkflowDumpCommand.php

@@ -18,6 +18,7 @@
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Workflow\Dumper\GraphvizDumper;
+use Symfony\Component\Workflow\Dumper\MermaidDumper;
 use Symfony\Component\Workflow\Dumper\PlantUmlDumper;
 use Symfony\Component\Workflow\Dumper\StateMachineGraphvizDumper;
 use Symfony\Component\Workflow\Marking;
@@ -51,7 +52,7 @@ protected function configure()
 
 <info>DOT</info>:  %command.full_name% <workflow name> | dot -Tpng > workflow.png
 <info>PUML</info>: %command.full_name% <workflow name> --dump-format=puml | java -jar plantuml.jar -p > workflow.png
-
+<info>MERMAID</info>: %command.full_name% <workflow name> --dump-format=mermaid | mmdc -o workflow.svg
 EOF
             )
         ;
@@ -75,13 +76,20 @@ protected function execute(InputInterface $input, OutputInterface $output): int
             throw new InvalidArgumentException(sprintf('No service found for "workflow.%1$s" nor "state_machine.%1$s".', $serviceId));
         }
 
-        if ('puml' === $input->getOption('dump-format')) {
-            $transitionType = 'workflow' === $type ? PlantUmlDumper::WORKFLOW_TRANSITION : PlantUmlDumper::STATEMACHINE_TRANSITION;
-            $dumper = new PlantUmlDumper($transitionType);
-        } elseif ('workflow' === $type) {
-            $dumper = new GraphvizDumper();
-        } else {
-            $dumper = new StateMachineGraphvizDumper();
+        switch ($input->getOption('dump-format')) {
+            case 'puml':
+                $transitionType = 'workflow' === $type ? PlantUmlDumper::WORKFLOW_TRANSITION : PlantUmlDumper::STATEMACHINE_TRANSITION;
+                $dumper = new PlantUmlDumper($transitionType);
+                break;
+
+            case 'mermaid':
+                $transitionType = 'workflow' === $type ? MermaidDumper::TRANSITION_TYPE_WORKFLOW : MermaidDumper::TRANSITION_TYPE_STATEMACHINE;
+                $dumper = new MermaidDumper($transitionType);
+                break;
+
+            case 'dot':
+            default:
+                $dumper = ('workflow' === $type) ? new GraphvizDumper() : new StateMachineGraphvizDumper();
         }
 
         $marking = new Marking();