fix(proto): introduce StatefulColumn concept

[ernado]

Fix #30
Update #25
Update #22

[codecov]

Codecov Report

Merging #31 (fa1316c) into main (2a942e8) will decrease coverage by 1.10%.
The diff coverage is 58.43%.

@@            Coverage Diff             @@
##             main      #31      +/-   ##
==========================================
- Coverage   84.65%   83.55%   -1.11%     
==========================================
  Files         110      111       +1     
  Lines        4588     4651      +63     
==========================================
+ Hits         3884     3886       +2     
- Misses        544      588      +44     
- Partials      160      177      +17     

Impacted Files	Coverage Δ
proto/column.go	91.39% <ø> (ø)
proto/col_map.go	42.00% <17.64%> (-21.64%)	⬇️
proto/col_low_cardinality.go	63.86% <28.57%> (-13.62%)	⬇️
proto/col_tuple.go	83.33% <41.66%> (-16.67%)	⬇️
proto/block.go	73.13% <60.00%> (-0.51%)	⬇️
proto/results.go	70.10% <70.10%> (ø)
proto/col_arr.go	72.22% <85.71%> (-2.40%)	⬇️
proto/col_bool_unsafe.go	71.42% <0.00%> (-14.29%)	⬇️
proto/col_uuid_unsafe.go	81.81% <0.00%> (-9.10%)	⬇️
... and 1 more

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