feat(ui): dashboard variable chaining

[srikanthccv]

Addresses #1973

https://www.loom.com/share/75fb347f451e4c12b49c6f227e2918fc

This PR adds support for variable chaining. Whenever a variable changes, its dependent variable should be updated too. The default value for this dependent variable will be ALL values for multi-select and the first option for single-select. The independent variable remains the same.

Code changes:

There is a new API for this. This new API is POST request which accept the payload of the following type.

{
  "query": "select distinct(JSONExtractString(labels, 'operation')) FROM signoz_metrics.time_series_v2 Where JSONExtractString(labels, 'service_name') IN {{.service_name}};",
  "variables": {
    "http_status_code": "",
    "op": [
      "/driver.DriverService/FindNearest",
      "HTTP GET /dispatch",
      "HTTP GET: /route",
      "HTTP GET: /customer",
      "HTTP GET",
      ""
    ],
    "service_name": [
      "frontend"
    ],
    "span_kind": "SPAN_KIND_SERVER"
  }
}

And the VariableItem is updated with its onVarUpdate triggering subsequent updates for dependent vars.

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[srikanthccv]

I am going to record a video and post it for better understanding.

[srikanthccv]

Loom https://www.loom.com/share/75fb347f451e4c12b49c6f227e2918fc

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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