feat: added codestart

[mcollovati]

Description

Added a codestart that provides a Flow application with an example view

Closes #112

Type of change

• [ ] Bugfix
• [x] Feature

Checklist

• [x] I have read the contribution guide: https://vaadin.com/docs/latest/guide/contributing/overview/
• [x] I have added a description following the guideline.
• [x] The issue is created in the corresponding repository and I have referenced it.
• [x] I have added tests to ensure my change is effective and works as intended.
• [x] New and existing tests are passing locally with my change.
• [x] I have performed self-review and corrected misspellings.

Additional for Feature type of change

• [ ] Enhancement / new feature was discussed in a corresponding GitHub issue and Acceptance Criteria were created.

[mcollovati]

To test, after building locally the extension, in a temporary directory run

mvn io.quarkus.platform:quarkus-maven-plugin:3.0.1.Final:create \
 -DprojectGroupId=org.acme -DprojectArtifactId=getting-started \
 -Dextensions='com.vaadin:vaadin-quarkus:2.0-SNAPSHOT' -DwithCodestart \
 -Ddata="vaadin-flow-codestart.vaadinVersion=24.0.5"

The command will create a Quarkus based Vaadin application, that can be launched in dev mode with mvn quarkus:dev and in production mode with mvn -Pproduction package and java -jar target/quarkus-app/quarkus-run.jar

The vaadin-flow-codestart.vaadinVersion property can also be set to use a snapshot (e.g. 24.1-SNAPSHOT); in this case the Vaadin pre-release repositories are added to the pom file.

[czp13]

Executed with mvn -Pproduction package

• and got some errors like:

  [ERROR] Error fetching link: /Users/pczuczor/Projects/quarkus/integration-tests/reusable-theme/target/apidocs. Ignored it.
  [ERROR] Error fetching link: /Users/pczuczor/Projects/quarkus/integration-tests/test-addons/addon-with-jandex/target/apidocs. Ignored it.
  [ERROR] Error fetching link: /Users/pczuczor/Projects/quarkus/integration-tests/test-addons/addon-without-jandex/target/apidocs. Ignored it.
  [ERROR] Error fetching link: /Users/pczuczor/Projects/quarkus/integration-tests/custom-websocket-dependency/target/apidocs. Ignored it.

  Probably expected some kind of documentation in multiple places, but eventually, the build got green.

In the end got this mesage:

[WARNING] The requested profile "production" could not be activated because it does not exist.

Also did not see in the root pom.xml Should we add the production profile there, or it is looking somewhere

Also tried to just run in the root:

• mvn clean install
• mvn package

Did not get the temporary director...

Update, ok, I got lost :).

Start in a different way now:

1. mvn clean install
2. cd runtime/target (temp directory I guess) (Getting the Error fetching link errors shared above, I think these are cosmetic or would be nice to have notifications/errors)
3. there:

   mvn io.quarkus.platform:quarkus-maven-plugin:3.0.1.Final:create \
   -DprojectGroupId=org.acme -DprojectArtifactId=getting-started \
   -Dextensions='com.vaadin:vaadin-quarkus:2.0-SNAPSHOT' -DwithCodestart \
   -Ddata="vaadin-flow-codestart.vaadinVersion=24.0.5"

   Result:

   [INFO] 📚 java
   🔨 maven
   📦 quarkus
   📝 config-properties
   🔧 dockerfiles
   🔧 maven-wrapper
   🚀 vaadin-flow-codestart
   [INFO]
   -----------
   [SUCCESS] ✅  quarkus project has been successfully generated in:
   --> /Users/pczuczor/Projects/quarkus/runtime/target/getting-started

4. cd getting-started
5. mvn quarkus:dev

After a couple of:

Press [r] to re-run, [o] Toggle test output, [:] for the terminal, [h] for more options>

Quarkus DEV UI is running:

First getting some Read timeout exceptions (maybe my laptop is slow):

2023-05-10 13:26:10,696 INFO  [com.vaa.qua.QuarkusInstantiator] (executor-thread-1) Can't find any @VaadinServiceScoped bean implementing 'I18NProvider'. Cannot use CDI beans for I18N, falling back to the default behavior.

2023-05-10 13:28:36,181 ERROR [com.vaa.flo.ser.DefaultErrorHandler] (executor-thread-2) : java.io.IOException: Read timeout
    at io.undertow.vertx.VertxHttpExchange.readBlocking(VertxHttpExchange.java:505)

But eventually, Vaadin App is also running, and reachable:

7. mvn -Pproduction package works as well, creating the jar without any error! 🎉

8. java -jar target/quarkus-app/quarkus-run.jar Works too, application is reachable on: http://localhost:8080/ in my case.

[sonarcloud[bot]]

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0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[mcollovati]

• in the add-on codebase, production profile is not defined. You can find it in the project generated by quarkus maven plugin
• javadocs error messages, are expected as the mentioned modules are only used for tests. We can probably set the skip flag
• temporary directory is any directory on the file system, it is not related to the add-on project
• I tested project creation again and cannot see the Read Timeout errors

For the notes, it may be worth creating some tickets, as they are not strictly related to the changes in this PR