Update JSON schema for plugin v2 (#1898)

## Summary

Update JSON schema for Devbox Plugins

## How was it tested?

Author: Lagoja

.schema/devbox-plugin.schema.json

@@ -21,6 +21,74 @@
       "description": "A short description of the plugin and how it works. This will automatically display when the user first installs the plugin, or runs `devbox info`",
       "type": "string"
     },
+    "packages": {
+      "description": "Collection of packages to install",
+      "oneOf": [
+        {
+          "type": "array",
+          "items": {
+            "description": "Name and version of each package in name@version format.",
+            "type": "string"
+          }
+        },
+        {
+          "type": "object",
+          "description": "Name of each package in {\"name\": {\"version\": \"1.2.3\"}} format.",
+          "patternProperties": {
+            ".*": {
+              "oneOf": [
+                {
+                  "type": "object",
+                  "description": "Version number of the specified package in {\"version\": \"1.2.3\"} format.",
+                  "properties": {
+                    "version": {
+                      "type": "string",
+                      "description": "Version of the package"
+                    },
+                    "platforms": {
+                      "type": "array",
+                      "description": "Names of platforms to install the package on. This package will be skipped for any platforms not on this list",
+                      "items": {
+                        "enum": [
+                          "i686-linux",
+                          "aarch64-linux",
+                          "aarch64-darwin",
+                          "x86_64-darwin",
+                          "x86_64-linux",
+                          "armv7l-linux"
+                        ]
+                      }
+                    },
+                    "excluded_platforms": {
+                      "type": "array",
+                      "description": "Names of platforms to exclude the package on",
+                      "items": {
+                        "enum": [
+                          "i686-linux",
+                          "aarch64-linux",
+                          "aarch64-darwin",
+                          "x86_64-darwin",
+                          "x86_64-linux",
+                          "armv7l-linux"
+                        ]
+                      }
+                    },
+                    "glibc_patch": {
+                      "type": "boolean",
+                      "description": "Whether to patch glibc to the latest available version for this package"
+                    }
+                  }
+                },
+                {
+                  "type": "string",
+                  "description": "Version of the package to install."
+                }
+              ]
+            }
+          }
+        }
+      ]
+    },
     "env": {
       "type": "object",
       "description": "List of additional environment variables to be set in the Devbox environment. These can be overridden by environment variables set in the user's devbox.json",
@@ -48,8 +116,30 @@
         "init_hook": {
           "type": ["array", "string"],
           "description": "Shell command to run right before initializing the user's shell, running a script, or starting a service"
+        },
+        "scripts": {
+          "description": "List of command/script definitions to run with `devbox run <script_name>`.",
+          "type": "object",
+          "patternProperties": {
+            ".*": {
+              "description": "Alias name for the script.",
+              "type": ["array", "string"],
+              "items": {
+                "type": "string",
+                "description": "The script's shell commands."
+              }
+            }
+          }
         }
       }
+    },
+    "include": {
+      "description": "List of additional plugins to activate within your devbox shell",
+      "type": "array",
+      "items": {
+        "description": "Name of the plugin to activate.",
+        "type": "string"
+      }
     }
   },
   "required": ["name", "version", "readme"]