founders selector in social metrics

[IvanIvanoff]

Changes

Support founders selector, which is directly sent as founders to metricshub instead of as search_text:

{
getMetric(metric:"social_volume_total"){
  timeseriesData(selector: {founders: ["vitalik buterin"]} from:"utc_now-33d" to: "utc_now-30d"){
    datetime
    value
  }
}} 

Ticket

Checklist:

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have tried to find clearer solution before commenting hard-to-understand parts of code
• I have added tests that prove my fix is effective or that my feature works