Add custom code option which is called after content is ready

[asimonok]

Add a new custom code option (After Render Code) which is called for every row after row content was rendered. It's a good place to get access to DOM elements, draw charts and add event listeners.

Context object

element -> row DOM element
data -> row data
grafana: {
  replaceVariables,
  eventBus,
  locationService
}

Code example:

console.log(context);

return () => {
  console.log('destroy and unsubscribe');
}

Resolves #228 Resolves #225 Resolves #210 Resolves #216 Resolves #223 Resolves #221

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (0015994) 98.89% compared to head (24bb287) 98.95%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #231 +/- ## ========================================== + Coverage 98.89% 98.95% +0.05% ========================================== Files 33 35 +2 Lines 362 381 +19 Branches 45 48 +3 ========================================== + Hits 358 377 +19 Misses 3 3 Partials 1 1 ```

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