FEM Subject Toolbar should have tooltip labels on hover

[seanmiller26]

Package

Is your feature request related to a problem? Please describe.

On hover a label should appear to tell volunteers what each tool does. Similar to the functionality in PFE.

Describe the solution you'd like

• Edit tool: Annotate
• Pan tool: Pan
• Zoom tools: Zoom In, Zoom Out
• Rotate tool: Rotate
• Reset tool: Reset View
• Invert tool: Invert Colors

Describe alternatives you've considered

A clear and concise description of any alternative solutions or features you've considered.

Additional context

Add any other context or screenshots about the feature request here.

[eatyourgreens]

If you want to hide content from mobile and tablet users as well as assistive tech users and keyboard only users, use the title attribute.

https://www.tpgi.com/using-the-html-title-attribute-updated/

[goplayoutside3]

Linking this related Issue that talks about possible helper labels for the toolbar: https://github.com/zooniverse/front-end-monorepo/issues/76