feat(dashboard): new design for dashboard

[tthvo]

Fixes #11
Fixes #2
Depends on cryostatio/jfr-datasource#135

What's new?

• Main dashboard name is now Cryostat Dashboard.
• Events are placed in their respective categories.
• Graph now displays correct units (i.e. no more ~23 PETAbytes memory usage :d)
• Default time frame is set to 24h-ago <-> now.
• A separate dashboard with filters for jdk.ObjectAllocationSample.
• Each "sub" dashboard should have direct link back to the Main Dashboard.
• Dashboard will open main Cryostat Dashboard on launch.
• Duration and Start time of recording is fixed for any time frame of a single recording. See comment.

[tthvo]

Default time frame is set to 1-year-ago - now.

This just ensures the data is visible at least until this feature grafana/grafana#6288 is implemented :D

[andrewazores]

There's still a Zoom Out button near the top right corner of the dashboard screen, right? If so, I think a narrower default time range would be better. A year-long JFR file would probably be prohibitively large in size and unlikely to load at all. I think just the past hour would be a better middleground default. Good chance the recording is shorter so the user needs to zoom in somewhat, but it may also be somewhat longer so the user might need to zoom out using the top date range toolbar controls.

[tthvo]

There's still a Zoom Out button near the top right corner of the dashboard screen, right? If so, I think a narrower default time range would be better. A year-long JFR file would probably be prohibitively large in size and unlikely to load at all. I think just the past hour would be a better middleground default. Good chance the recording is shorter so the user needs to zoom in somewhat, but it may also be somewhat longer so the user might need to zoom out using the top date range toolbar controls.

Right! That makes sense! Then, I restore it back to last 24-h as we had previously.

[tthvo]

The corresponding datasource PR just needs tests fixed so I think you can test them out.

[andrewazores]

Fantastic work.

[maxcao13]

Awesome job, looks great!