Feature/lior/v1.0.8

[LiorRacer]

What this PR does / why we need it:
Supporting Grafana V7.
The issues below solved/closed:

Which issue(s) this PR fixes:
[duplicate] Issues graphing data #243
[closed] __timeGroup does not use my time variable #242
[closed] Unable to select jsonPayload.bytes_sent in GCP VPC Flow logs as SELECT Column value. #239
[closed] $__timeGroup(...., auto) fails for shorter time spans #235
[closed] Unable to use plugin with GKE Workload Identity #233
[enhancement] Support group by scenarios for the auto interval #232
[closed] Invalid date on graph chart #231
[closed] Support date type #230

[codecov]

Codecov Report

Merging #245 into master will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #245      +/-   ##
==========================================
+ Coverage   65.49%   65.52%   +0.03%     
==========================================
  Files           3        3              
  Lines         994      995       +1     
  Branches      236      237       +1     
==========================================
+ Hits          651      652       +1     
- Misses        337      343       +6     
+ Partials        6        0       -6     

Impacted Files	Coverage Δ
src/datasource.ts	47.49% <ø> (ø)
src/bigquery_query.ts	79.50% <100.00%> (+0.05%)	⬆️
src/response_parser.ts	76.60% <100.00%> (ø)

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