Clickhouse: Convert non-string json values to string to prevent file.d fall

[vadimalekseev]

Related with #356

[codecov]

Codecov Report

Patch coverage: 70.60% and project coverage change: +0.64 🎉

Comparison is base (a40b94d) 64.78% compared to head (0cd8bd0) 65.42%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #357      +/-   ##
==========================================
+ Coverage   64.78%   65.42%   +0.64%     
==========================================
  Files         102      103       +1     
  Lines        9975    10079     +104     
==========================================
+ Hits         6462     6594     +132     
+ Misses       3086     3039      -47     
- Partials      427      446      +19     

Impacted Files	Coverage Δ
plugin/output/clickhouse/column_gen.go	21.42% <15.38%> (+2.06%)	⬆️
plugin/output/clickhouse/column_custom.go	52.19% <52.89%> (-0.80%)	⬇️
plugin/output/clickhouse/clickhouse.go	68.53% <63.63%> (-0.07%)	⬇️
plugin/output/clickhouse/column_insane.go	87.50% <87.50%> (ø)
e2e/file_clickhouse/clickhouse_file.go	100.00% <100.00%> (ø)
e2e/file_clickhouse/sample.go	100.00% <100.00%> (ø)
plugin/output/clickhouse/infer.go	63.82% <100.00%> (+7.50%)	⬆️

... and 1 file with indirect coverage changes

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