Extract connector/kamelet/schema files through maven-resource-plugin

[igarashitm]

We currently have hard copies for those in the repo for prod build
https://github.com/KaotoIO/kaoto-backend/blob/main/api/src/main/resources/camel-connectors-3.21.0.zip
https://github.com/KaotoIO/kaoto-backend/blob/main/api/src/main/resources/camel-kamelets-3.20.6.jar
https://github.com/KaotoIO/kaoto-backend/blob/main/camel-support/src/main/resources/io/kaoto/backend/camel/service/deployment/generator/camelroute/camel-yaml-dsl.json

Investigate to extract those directly from maven dependency, so that we can only specify camel version and then those are automatically resolved at build time.
At the same time, we'd want to keep a way to override by placing those local files for customization.

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