Add data caching to dashboards

[narsaynorath]

Environment

SaaS (https://sentry.io/)

Steps to Reproduce

1. Go to dashboard
2. Edit a widget
3. Go back to dashboard

Expected Result

The unedited dashboards are cached for a certain period of time and don't need to re-query the events/events-stats endpoints

Actual Result

The dashboards query each time the navigation is completed

Product Area

Dashboards

Link

No response

DSN

No response

Version

No response

[getsantry]

Routing to @getsentry/product-owners-dashboards for triage ⏲️

[narsaynorath]

The issue with caching is that within a single session of viewing the dashboard, new widgets or edited widgets will be updated but old ones could be stale. We should look at applying a reasonable cache limit, possibly in relation to the overall time window being requested.