feat: improve plugin.json with multiple authors, versions, and pre-compilation dependency checking

- Add support for multiple authors and contributors in plugin.json
- Maintain backwards compatibility with single author (string) format
- Add versions array to specify compatible Open Ticket versions (e.g., OTv4.0.x, ODv1.0.0)
- Implement version compatibility checking during plugin loading
- Read plugin.json files before TypeScript compilation to check npm dependencies
- Warn about missing npm dependencies before compilation starts
- Update example plugin to demonstrate new features

Fixes #162

plugins/example-plugin/plugin.json

@@ -14,6 +14,9 @@
 
     "details":{
         "author":"DJj123dj",
+        "authors":["DJj123dj"],
+        "contributors":[],
+        "versions":["OTv4.0.x","OTv4.1.x"],
         "shortDescription":"A simple template for an Open Ticket v4 plugin!",
         "longDescription":"A simple example of an Open Ticket v4 plugin!",
         "imageUrl":"",