Provide Camel stack for Che 7

[apupier]

Description

content:

• Camel plugin (requires Include Apache Camel Language Support VS Code Extension che-plugin-registry#109 )
• XML plugin
• Java plugin
• same other configurations than what is available for a SpringBoot stack
• Sample project https://github.com/jboss-fuse/fuse-rest-http-booster

for reference see stack for Che 6 https://github.com/eclipse/che/blob/b8fa90c72b934030686cecc06c9366f44bc2f803/ide/che-core-ide-stacks/src/main/resources/stacks.json#L2532

[apupier]

blocked by #13146 and merge of eclipse-che/che-plugin-registry#110

[tsmaeder]

Make sure the stack is consistent with the one described in #12620

[apupier]

started a branch for it https://github.com/apupier/che/pull/new/13182-ProvideCamelStackForChe7 but unable to test it for now due memory size issues.
Also:

• not understood what PS1 advice in New Che 7 Stacks #12620 is for
• not understood in which case /home/users needs to be mounted.

[apupier]

memory limits will surely needs to be adjusted compared to what is currently put in the branch https://github.com/apupier/che/pull/new/13182-ProvideCamelStackForChe7 , see #13146 (comment)