CAMEL-17792: Add documentation about the message headers (P-Q)

[essobedo]

https://issues.apache.org/jira/browse/CAMEL-17792

Motivation

It is now possible to document a message header using annotations, let's leverage it to document the headers of the components.

Modifications

For all the components whose name starts with a P or Q

• Document the messages headers using the annotations
• Migrate the existing documentation of message headers to use the annotations instead
• Move constants corresponding to headers to the headers class.

[github-actions]

⚠️ This PR changes Camel components and will be tested automatically.

[davsclaus]

You are getting closer to Z ;)

[github-actions]

🚫 There are too many components to be tested in this PR, components were removed or the code needs a rebase: (12 likely to be tested)

[essobedo]

You are getting closer to Z ;)

I hope, I will be able to finish this week. It is a very long and laborious task. I'm looking forward finishing it to be able to do something else 😄

BTW, for some components, I moved directly the constants from other classes (like the for example the EntryPoint class) to the Constants class while maybe the proper way was to duplicate the constants and mark the constants defined in other classes as deprecated, WDYT?

[davsclaus]

yes this is good