feat: add panel get plugins endpoint

Pano/src/main/kotlin/com/panomc/platform/route/api/panel/PanelGetPluginsAPI.kt

@@ -0,0 +1,44 @@
+package com.panomc.platform.route.api.panel
+
+import com.panomc.platform.PanoPluginWrapper
+import com.panomc.platform.PluginManager
+import com.panomc.platform.annotation.Endpoint
+import com.panomc.platform.model.*
+import io.vertx.ext.web.RoutingContext
+import io.vertx.json.schema.SchemaParser
+import java.io.PrintWriter
+import java.io.StringWriter
+
+@Endpoint
+class PanelGetPluginsAPI(
+    private val pluginManager: PluginManager
+) : Api() {
+    override val paths = listOf(Path("/api/panel/plugins", RouteType.GET))
+
+    override fun getValidationHandler(schemaParser: SchemaParser) = null
+
+    override suspend fun handle(context: RoutingContext): Result {
+        val result = mutableMapOf(
+            "plugins" to pluginManager.plugins.map { it as PanoPluginWrapper }.associate {
+                it.pluginId to mapOf(
+                    "author" to it.descriptor.provider,
+                    "version" to it.descriptor.version,
+                    "status" to it.pluginState,
+                    "dependencies" to it.descriptor.dependencies,
+                    "license" to it.descriptor.license,
+                    "error" to if (it.failedException == null) null else getStackTraceAsString(it.failedException),
+                    "hash" to it.hash
+                )
+            }
+        )
+
+        return Successful(result)
+    }
+
+    private fun getStackTraceAsString(exception: Throwable): String {
+        val stringWriter = StringWriter()
+        val printWriter = PrintWriter(stringWriter)
+        exception.printStackTrace(printWriter)
+        return stringWriter.toString()
+    }
+}