feat(java client): Generalize generateClientAsBean for webclient and restclient libraries (#19229)

[elvay1]

Add usage of generateClientAsBean annotation in RestClient and Webclient templates and include it in documentation.

It leverages the same mechanisms as the resttemplate library template ie: add the following template before ApiClient class and all generated APIs classes

{{#generateClientAsBean}}
@Component("{{package}}.{{classname}}")
{{/generateClientAsBean}

@bbdouglas, @sreeshas, @jfiala, @lukoyanov, @cbornet, @jeff9finger, @karismann, @Zomzog, @lwlee2608, @martin-mfg

Fix #19229
Fix #17885

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[huberrom]

Would be really helpful for us as well

[martin-mfg]

Hi @elvay1, thanks for the PR!

The PR which originally introduced generateClientAsBean for the resttemplate library (#15416) added @Autowired along with @Component. Would it make sense to do this here too?

Also, could you resolve the conflicts with the master branch please?

[wing328]

@elvay1 thanks again for the PR

let us know if you need help resolving the merge conflicts

another way is to file a new PR based on the latest master

looking forward to incorporating your enhancements into the latest master