Improve layout of helidon.zip

[romain-grecourt]

unzip -l helidon.zip            
Archive:  helidon.zip
  Length      Date    Time    Name
---------  ---------- -----   ----
        0  06-22-2023 18:32   helidon-3.0.5/
        0  06-22-2023 18:32   helidon-3.0.5/lib/
        0  06-22-2023 18:32   helidon-3.0.5/bin/
        0  06-22-2023 18:32   helidon-3.0.5/lib/libs/
    97577  06-22-2023 18:32   helidon-3.0.5/lib/helidon.jar
     1440  01-31-2023 11:48   helidon-3.0.5/bin/helidon.bat
     2398  01-31-2023 11:48   helidon-3.0.5/bin/helidon
    11359  10-05-2021 16:44   helidon-3.0.5/LICENSE.txt
   264058  06-22-2023 18:31   helidon-3.0.5/lib/libs/helidon-archetype-engine-v2-3.0.5.jar
    27101  06-22-2023 18:31   helidon-3.0.5/lib/libs/helidon-cli-common-3.0.5.jar
    55585  06-22-2023 18:31   helidon-3.0.5/lib/libs/helidon-cli-plugin-3.0.5.jar
   100892  01-29-2021 19:49   helidon-3.0.5/lib/libs/compiler-0.9.6.jar
    74728  06-22-2023 18:31   helidon-3.0.5/lib/libs/helidon-cli-harness-3.0.5.jar
     7866  06-22-2023 18:31   helidon-3.0.5/lib/libs/helidon-build-devloop-common-3.0.5.jar
    18499  06-05-2023 13:37   helidon-3.0.5/lib/libs/helidon-build-common-xml-3.0.5.jar
    35539  06-05-2023 13:26   helidon-3.0.5/lib/libs/helidon-build-common-ansi-3.0.5.jar
   140375  06-05-2023 13:26   helidon-3.0.5/lib/libs/helidon-build-common-3.0.5.jar
    39360  06-05-2023 13:37   helidon-3.0.5/lib/libs/helidon-build-common-maven-3.0.5.jar
    60576  06-22-2023 18:31   helidon-3.0.5/lib/libs/helidon-archetype-engine-v1-3.0.5.jar
   287352  01-29-2021 19:49   helidon-3.0.5/lib/libs/jansi-1.18.jar
---------                     -------
  1224705                     20 files

We should try to have all jar files include helidon.jar under libs and avoid lib/libs.
Or we can find another name for lib, but so far I could not come-up with anything good.