chore: fix ag-grid-plugin build

but I still don't know why this packages are required

webapp/packages/ag-grid-plugin/package.json

@@ -22,6 +22,8 @@
     "@dbeaver/builder": "^0.1.0"
   },
   "peerDependencies": {
-    "@dbeaver/core": "^0.1.0"
+    "@dbeaver/core": "^0.1.0",
+    "react": "^16.3.0",
+    "react-dom": "^16.3.0"
   }
 }

webapp/packages/builder/package.json

@@ -45,6 +45,7 @@
     "postcss-discard-comments": "^4.0.2",
     "postcss-import": "^12.0.1",
     "preact": "^10.4.1",
+    "preact-render-to-string": "^5.1.6",
     "react-dom": "^16.13.1",
     "react-hot-loader": "^4.12.18",
     "reakit": "1.0.0-beta.11",

webapp/yarn.lock

@@ -9370,6 +9370,13 @@ postcss@^7.0.27:
     source-map "^0.6.1"
     supports-color "^6.1.0"
 
+preact-render-to-string@^5.1.6:
+  version "5.1.8"
+  resolved "https://registry.yarnpkg.com/preact-render-to-string/-/preact-render-to-string-5.1.8.tgz#5540f4c1b1fcf1e7c7dfb154d38053e717ca1fe4"
+  integrity sha512-9c2OFfOJ2Zi7ppMbHYC5lx1ebDFXpDGBMns9/YaKMgZGElUY90xTGmsKeNMqrNoDo7ImYPh715Ke6Ah/pdjW0g==
+  dependencies:
+    pretty-format "^3.8.0"
+
 preact@^10.4.1:
   version "10.4.1"
   resolved "https://registry.yarnpkg.com/preact/-/preact-10.4.1.tgz#9b3ba020547673a231c6cf16f0fbaef0e8863431"
@@ -9398,6 +9405,11 @@ pretty-error@^2.0.2:
     renderkid "^2.0.1"
     utila "~0.4"
 
+pretty-format@^3.8.0:
+  version "3.8.0"
+  resolved "https://registry.yarnpkg.com/pretty-format/-/pretty-format-3.8.0.tgz#bfbed56d5e9a776645f4b1ff7aa1a3ac4fa3c385"
+  integrity sha1-v77VbV6ad2ZF9LH/eqGjrE+jw4U=
+
 private@^0.1.6:
   version "0.1.8"
   resolved "https://registry.yarnpkg.com/private/-/private-0.1.8.tgz#2381edb3689f7a53d653190060fcf822d2f368ff"