Support creating a new maven module to existing multi-module project via 'New Module...' command

[testforstephen]

Closes #849

What this PR does: 1) In File Explorer context menu, rename the old menu "Create Maven Project" to "Maven / New Project..." 2) Add a new context menu "Maven / New Module..." to the File Explorer view. This command will provide a simplified wizard to create a new module to the existing maven project.

3) Automatically import the newly created maven module as a Java project after the wizard "New Project/Module" is finished.

The difference between "New Project..." and "New Module...":

• "New Project..." command is a general command to use maven archetype to create a maven project in any location, either inside or outside your current workspace.
• The “New Module…” command is a convenient way to create a new module within your current workspace. It prompts you to select the parent pom and automatically adds the new module to it.

See the demo on "New Module..." command.

https://github.com/microsoft/vscode-maven/assets/14052197/4aac6a4d-4d9d-4a59-8096-d2e7231c936c

[jdneo]

Would you like to register the new module command to the Java Projects view as well?

It's not necessary to do that in this PR. If you plan to do that, an issue can be filed first to track it.

[testforstephen]

Would you like to register the new module command to the Java Projects view as well?

It's not necessary to do that in this PR. If you plan to do that, an issue can be filed first to track it.

Issue created https://github.com/microsoft/vscode-maven/issues/1019. Yes, I plan to add this feature to the Java Projects view as well. For now, I will release it in vscode-maven first to test its user adoption.