[SLO] Create an embeddable Burn rate chart widget

[mgiota]

Depends on #181409. We first need to migrate existing embeddables into the new Embeddable Framework, before moving on with new embeddables.

🍒 Summary

User's would like a way to embed an SLO Burn rate chart widget to their dashboards.

✔️ Acceptance criteria

• The embeddable widget is accessible from the Lens dashboard library
• The user should be able to select the SLO and filter to instanceId
• The embeddable widget should honor the dashboard time picker
• The embeddable widget should react to the Dashboard Controls dropdown
• Add to dashboard option that embeds the error rate chart widget on custom dashboards (could be done in a separate issue)

[elasticmachine]

Pinging @elastic/actionable-observability (Team: Actionable Observability)

[mgiota]

I would postpone this one, until we tackle https://github.com/elastic/actionable-observability/issues/162

[elasticmachine]

Pinging @elastic/obs-ux-management-team (Team:obs-ux-management)

[mgiota]

The burn rate chart has been updated to fetch the user defined windows and threshold values for the burn rate rule in this PR. We can reuse what we currently have and convert existing burn rate chart into an embeddable.

There is a new dependency now. We first need to migrate our current embeddables into the new Embeddable Framework, which is already work in progress. Once the migration is complete, we will prioritize implementing the Error rate chart Embeddable using the new React registry.

cc @hwoarang

[jasonrhodes]

@mgiota have you started this with any code at all? If not, could you pair with @kdelemme and help him take this on, to spread embeddable knowledge with the team? Thanks!

[jasonrhodes]

How does this ticket relate to the work done here #189429