fix(Annotation Tools): Fix active volume to show correct cachedStats (especially on fusion viewport)

[Celian-abd]

Context

Currently, even if we set the PT volumeId into the configuration of Rectangle/Circle/EllipticalRoiTools, it will always show the cachedStats of the CT on the fusion viewport.

As we can see here :

Changes & Results

• Added a way to check if a volumeId is provided in the tool configuration
• Select the correct cachedStats to show following the volumeId

If we set PT volumeId in the tool configuration :

Testing

Example PET-CT
You can modify or delete the prefered volumeId in the tool configuration :
fusionToolGroup.addTool(RectangleROITool.toolName, { volumeId: ptVolumeId });

Checklist

PR

• [] My Pull Request title is descriptive, accurate and follows the
  semantic-release format and guidelines.

Code

• [] My code has been well-documented (function documentation, inline comments,
  etc.)

Public Documentation Updates

• [] The documentation page has been updated as necessary for any public API
  additions or removals.

Tested Environment

• [] "OS:
• [] "Node version:
• [] "Browser:

[sedghi]

do these in the this.getTargetId so that you don't need to repeat yourself, i think that was a parent method