Update Jetty server foundation to Jetty EE10

Change to the new Jetty server EE10.
All libs updated to the latest releases.
Some code improvements.

Requires nor Java 17 or later!

Chunking improved

Sometimes we got the problem clients complains "CRLF expected at end of chunk"
Chunking will be steered now only from the container and not forced automatically by the servlet.

Charset problem solved

Some UTF-8 characters are not returned correctly because of a mismatch of char set settings.

Prometheus Metrics Interface added

Prometheus Metrics Interface under /metrics added
Contains now metrics about the count and duration of the calls

Improved Performance and additional services

This release allows to check the service for maintenance. Refer to the documentation!
You have to add the sapjco3.jar in the same folder as the saprfcproxyserver-1.2.jar.
Please note the sapjco3.jar needs always a native library installed on your system.
You can also simply put the native lib in the same folder as the sapjco3.jar.