More JAR/WAR containerization support

[chanseokoh]

Creating an umbrella issue to track various issues and feature requests related to JAR/WAR containerization.

• #1852 support fat/shaded JAR
  • An alternative is to have some means to exclude dependency JARs.
• #530 runnable JAR with java -jar
  • Most often fat JAR in practice but does not rule out slim JAR.
  • There seem use case where java -jar is useful where java -cp can't cover.
• #1555 Jib with Quarkus
  • Perhaps java -jar is really needed here. (#530)

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• #1859: command line tool to jib a JAR/WAR
• #1851 bootJar if Spring Boot?
  • Being a fat JAR, may depend on #1852.
  • Similarly in #1786.
  • Has a workaround.
  • Or more generally, have a way to configure a JAR task or path, or infer this automatically (applies to Maven too).
  • #1606 involves using classifier in the Spring Boot plugin.
• #1470 (low priority): get Main-Class from MANIFEST.MF from JAR

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FTR, duplicates closed:

• #1280 Thorntail / Payara Micro example
• #1194 Thorntail