feat(a11y): enable ECharts aria-label

[frassinier]

SUMMARY

Increasing accessibility support in Apache/Superset through enhanced a11y features, such as generating aria-label with Echarts, is crucial for ensuring inclusivity and usability for all users, including those with disabilities.

By adhering to WCAG guidelines and making adjustments to colors and patterns as required, we not only enhance the user experience for individuals with disabilities but also align with standards for accessibility, promoting a more inclusive and equitable platform for all users.

        aria: {
          enabled: true,
          decal: {
            show: true,
          },
        },

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[rusackas]

I'm not sure we want to turn on the patterns by default. A lot of people don't want/need them, and this provides no option to disable them. We could, of course, add a chart control, but I don't think that's much better. I think the right approach might be to wait until we have this SIP in effect, so a user can choose to apply this across the board for charts/dashboards they view/edit/create.

[frassinier]

@rusackas, I agree! but what do you think of just adding the automated aria-label, maybe under a feature flag?