* feat: show span percentile in span details
* feat: resource attribute selection for span percentile
* feat: wait for 2 secs for the first fetch of span percentile
* feat: add unit test cases for span percentiles
* feat: use style tokens
* feat: remove redundant test assertion
* chore: resolve conflicts
* feat: reset initial wait state on span change
* feat: update payload , endpoint as per new backend changes
* feat: address review comments
* feat: fetch span percentile without specific resource attributes - first time