Use -Xsharedclasses option to improve startup time (especially on zPDT / zD&T emulated environments)

[Joe-Winchester]

Is your feature request related to a problem? Please describe.
Zowe APIML startup can be improved on zPDT / zD&T emulator environments to be 1/2 using shared classes.

Describe the solution you'd like
More on shared classes can be found at the great blog by Colin at https://colinpaice.blog/2023/08/26/turbo-start-your-java-program-on-z-os-and-save-a-bucket-of-cpu/.
It's a -Xshareclasses:cacheDir=/tmp,name=rseapi’,restoreFromSnapshot’, cacheDirPerm=0777,groupAccess option and could be added to the start.sh scripts in each of the components.

Willingness to help
Very happy to help create a PR for this as well as do any testing, and I expect Colin (who has a zPDT and did the analysis on the improvements) would help test also.

[balhar-jakub]

The latest exploration shows that there seems to be an issue with the Java implementation of this functionality that together with Spring leads to the sharedclasses not being used at all even if enabled.