Standardize & apply standard formatting

[sgraband]

Standardize the formatting for the use in VSCode.
Use the java-formatter.xml file together with the vscjava.vscode-java-pack for Java formatting.
Define prettier as the default formatter for most of the files.
Exceptions include:

• dockerfiles are formatted using ms-azuretools.vscode-docker
• plantuml files are formatted using jebbs.plantuml

Also add all needed extensions to the recommendations.
Furthermore, transform all launch configs to tasks & debug configs.

Fixes #152

[jfaltermeier]

I pushed an additional commit. Some of the xml files still had tabs.
VS Code did not update these, the Theia IDE did. After it was fixed, VS Code also produces spaces instead of tabs.
Not sure what was/is the issue there.
Could you maybe shortly check if you can also change the xml files now without any additional changes?

[jfaltermeier]

In general I think it looks good.
Formatting seems to work and the the debug configurations / tasks also work.
If we notice any inconsistencies, we need to log new issues.

In general we should probably also add more documentation on how to run the theia cloud services locally, because e.g. the conversion webhook currently fails with java.nio.file.NoSuchFileException: /etc/webhook/certs/tls.crt, since this path is hard-coded in the application.properties

But this is out of context for this PR

[sgraband]

@jfaltermeier Thanks for the commit. For me both Theia IDE and VSCode do not change the formatting with tabs/whitespaces. So i can no longer reproduce that issue, so we should be good to go. More documentation regarding building locally definately makes sense, but i also agree that this should be done in a follow up 👍