Add example project to play around with the AS plugin

extras/plugin_example/.gitignore

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+
+# Created by https://www.gitignore.io/api/dart,intellij
+# Edit at https://www.gitignore.io/?templates=dart,intellij
+
+.vscode
+
+### Dart ###
+# See https://www.dartlang.org/guides/libraries/private-files
+
+# Files and directories created by pub
+.dart_tool/
+.packages
+build/
+# If you're building an application, you may want to check-in your pubspec.lock
+pubspec.lock
+
+# Directory created by dartdoc
+# If you don't generate documentation locally you can remove this line.
+doc/api/
+
+# Avoid committing generated Javascript files:
+*.dart.js
+*.info.json      # Produced by the --dump-info flag.
+*.js             # When generated by dart2js. Don't specify *.js if your
+                 # project includes source files written in JavaScript.
+*.js_
+*.js.deps
+*.js.map
+
+android/
+ios/
+
+### Intellij ###
+.idea/**/*
+# End of https://www.gitignore.io/api/dart,intellij

extras/plugin_example/README.md

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+Playground to test the analyzer plugin for `.moor` files. 
+
+## Playing around with this
+At the moment, [DartCode](https://dartcode.org/) with version `v3.4.0-beta.2` is needed to run the
+plugin. To set up the plugin, run the following steps
+
+1. Change the file `moor/tools/analyzer_plugin/pubspec.yaml` so that the `dependency_overrides`
+   section points to the location where you cloned this repository. This is needed because we
+   can't use relative paths for dependencies in analyzer plugins yet.
+2. In VS Code, change `dart.additionalAnalyzerFileExtensions` to include `moor` files:
+   ```json
+   {
+       "dart.additionalAnalyzerFileExtensions": [
+           "moor"
+       ]
+   }
+   ```
+3. If you already had the project open, close and re-open VS Code. Otherwise, simply open this
+   project.
+4. Type around in a `.moor` file - notice how you still don't get syntax highlighting because
+   VS Code required a static grammar for files and can't use a language server for that :(
+
+Debugging plugins is not fun. See the [docs](https://github.com/dart-lang/sdk/blob/master/pkg/analyzer_plugin/doc/tutorial/debugging.md)
+on some general guidance, and good luck. Enabling the analyzer diagnostics server can help.

extras/plugin_example/analysis_options.yaml

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+include: package:pedantic/analysis_options.yaml
+
+analyzer:
+  plugins:
+    - moor

extras/plugin_example/lib/test.dart

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+class Test {}

extras/plugin_example/lib/test.foobar

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+CREATE TABLE playground (
+  id INT NOT NULL PRIMARY KEY AUTOINCREMENT
+)

extras/plugin_example/lib/test.moor

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+CREATE TABLE playground (
+  id INT NOT NULL PRIMARY KEY AUTOINCREMENT
+)

extras/plugin_example/pubspec.yaml

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+name: plugin_example
+description: Playground to test the analyzer plugin
+
+environment:
+  sdk: '>=2.4.0 <3.0.0'
+
+dependencies:
+  moor:
+    path: ../../moor
+
+dev_dependencies:
+  pedantic: ^1.7.0
+  test: ^1.5.0

moor/tools/analyzer_plugin/pubspec.yaml

@@ -8,8 +8,8 @@ dependencies:
 # To work on this plugin, you need to add the absolute paths here. Relative paths aren't supported yet
 # https://github.com/dart-lang/sdk/issues/35281
 
-#dependency_overrides:
-#  moor_generator:
-#    path: /home/simon/IdeaProjects/moor/moor_generator
-#  sqlparser:
-#    path: /home/simon/IdeaProjects/moor/sqlparser
+dependency_overrides:
+  moor_generator:
+    path: /home/simon/IdeaProjects/moor/moor_generator
+  sqlparser:
+    path: /home/simon/IdeaProjects/moor/sqlparser