Plugin settings (#4143)

* Add backend support for plugin settings
* Add plugin settings config
* Add UI support for plugin settings

internal/api/resolver_model_config.go

@@ -0,0 +1,25 @@
+package api
+
+import (
+	"context"
+
+	"github.com/stashapp/stash/internal/manager/config"
+)
+
+func (r *configResultResolver) Plugins(ctx context.Context, obj *ConfigResult, include []string) (map[string]interface{}, error) {
+	if len(include) == 0 {
+		ret := config.GetInstance().GetAllPluginConfiguration()
+		return ret, nil
+	}
+
+	ret := make(map[string]interface{})
+
+	for _, plugin := range include {
+		c := config.GetInstance().GetPluginConfiguration(plugin)
+		if len(c) > 0 {
+			ret[plugin] = c
+		}
+	}
+
+	return ret, nil
+}