Support for Multi-module Projects in Liberty Tools

[yeekangc]

Enhance Liberty Tools to provide full support for multi-module Maven and Gradle projects across all supported IDEs (i.e. Eclipse IDE, IntelliJ IDEA, and VS Code).

• Appropriate detection of multi-module projects supported by Liberty Maven and Gradle plugins
• Tools' dashboard to display multi-module projects
• Corresponding launch of dev mode to work with multi-module projects

This epic maps to the following enhancements for the different IDE tools:

• https://github.com/OpenLiberty/liberty-tools-eclipse/issues/398
• https://github.com/OpenLiberty/liberty-tools-intellij/issues/4
• https://github.com/OpenLiberty/liberty-tools-vscode/issues/98

[scottkurz]

Another aspect to consider is the "devc" container use case. Should the IDE tools detect the Dockerfile location and set the containerfile, containerBuildContext parameters accordingly? (Would it need to know though that the user hasn't already set their own parms in pom.xml or via custom parms?)