Plugin Extensions: Require meta-data to be defined in plugin.json during development mode (#93429)

* feat: add extensions to the backend plugin model

* feat: update the frontend plugin types

* feat(pluginContext): return a `null` if there is no context found

This will be necessary to understand if a certain hook is running inside a plugin context or not.

* feat: add utility functions for checking extension configs

* tests: fix failing tests due to the type updates

* feat(AddedComponentsRegistry): validate plugin meta-info

* feat(AddedLinksRegistry): validate  meta-info

* feat(ExposedComponentsRegistry): validate meta-info

* feat(usePluginComponent): add meta-info validation

* feat(usePluginComponents): add meta-info validation

* feat(usePluginLinks): add meta-info validation

* fix: only validate meta-info in registries if dev mode is enabled

* tests: add unit tests for the restrictions functionality

* tests: fix Go tests

* fix(tests): revert accidental changes

* fix: run goimports

* fix: api tests

* add nested app so that meta data can bested e2e tested

* refactor(types): extract the ExtensionInfo into a separate type

* refactor(extensions/utils): use Array.prototype.some() instead of .find()

* refactor(usePluginLinks): update warning message

* feat(usePluginExtensions()): validate plugin meta-info

* Wip

* fix(e2e): E2E tests for extensions

* fix(extensions): allow multiple "/" slashes in the extension point id

* fix(extensions/validators): stop validating the plugin id pattern

---------

Co-authored-by: Erik Sundell <erik.sundell87@gmail.com>

pkg/api/dtos/plugins.go

@@ -17,6 +17,7 @@ type PluginSetting struct {
 	Info             plugins.Info         `json:"info"`
 	Includes         []*plugins.Includes  `json:"includes"`
 	Dependencies     plugins.Dependencies `json:"dependencies"`
+	Extensions       plugins.Extensions   `json:"extensions"`
 	JsonData         map[string]any       `json:"jsonData"`
 	SecureJsonFields map[string]bool      `json:"secureJsonFields"`
 	DefaultNavUrl    string               `json:"defaultNavUrl"`

pkg/api/frontendsettings.go

@@ -561,6 +561,8 @@ func (hs *HTTPServer) newAppDTO(ctx context.Context, plugin pluginstore.Plugin,
 		Preload:         false,
 		Angular:         plugin.Angular,
 		LoadingStrategy: hs.pluginAssets.LoadingStrategy(ctx, plugin),
+		Extensions:      plugin.Extensions,
+		Dependencies:    plugin.Dependencies,
 	}
 
 	if settings.Enabled {

pkg/api/plugins.go

@@ -209,6 +209,7 @@ func (hs *HTTPServer) GetPluginSettingByID(c *contextmodel.ReqContext) response.
 		SecureJsonFields: map[string]bool{},
 		AngularDetected:  plugin.Angular.Detected,
 		LoadingStrategy:  hs.pluginAssets.LoadingStrategy(c.Req.Context(), plugin),
+		Extensions:       plugin.Extensions,
 	}
 
 	if plugin.IsApp() {