Added Count() method for counting number of rows in a query

[codecov[bot]]

Codecov Report

Merging #179 into v1-4 will decrease coverage by 11.23%. The diff coverage is 100%.

@@            Coverage Diff             @@
##            v1-4     #179       +/-   ##
==========================================
- Coverage   68.4%   57.16%   -11.24%     
==========================================
  Files         19       19               
  Lines       1557     1564        +7     
==========================================
- Hits        1065      894      -171     
- Misses       442      619      +177     
- Partials      50       51        +1

Impacted Files	Coverage Δ
querier_selects.go	93.91% <100%> (-3.31%)	:arrow_down:
reform-db/models.go	0% <0%> (-76.48%)	:arrow_down:
reform-db/cmd_init.go	22.94% <0%> (-46.48%)	:arrow_down:
reform-db/cmd_init_mssql.go	0% <0%> (-34.49%)	:arrow_down:
reform-db/cmd_init_mysql.go	0% <0%> (-32.26%)	:arrow_down:
reform-db/cmd_init_postgres.go	0% <0%> (-32%)	:arrow_down:
reform-db/models_reform.go	38.6% <0%> (-23.42%)	:arrow_down:
querier.go	94.82% <0%> (-5.18%)	:arrow_down:
querier_commands.go	77.39% <0%> (-4.34%)	:arrow_down:

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[AlekSi]

I will take it from there. :)

[skamenetskiy]

Sorry, didn’t have time to finish that one :)