Add .timer command.

[tzzed]

This is a proposal for #443.

[codecov]

Codecov Report

Merging #445 (6f77506) into main (d8a0bff) will increase coverage by 0.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #445      +/-   ##
==========================================
+ Coverage   79.50%   79.61%   +0.11%     
==========================================
  Files          95       95              
  Lines        9655     9659       +4     
==========================================
+ Hits         7676     7690      +14     
+ Misses       1327     1322       -5     
+ Partials      652      647       -5     

Impacted Files	Coverage Δ
internal/sql/parser/drop.go	56.25% <0.00%> (ø)
internal/sql/parser/alter.go	75.60% <0.00%> (ø)
internal/sql/parser/delete.go	39.13% <0.00%> (ø)
internal/tree/tree.go	86.50% <0.00%> (+1.58%)	⬆️
internal/database/table.go	92.68% <0.00%> (+2.43%)	⬆️
types/encoding/encoding.go	87.20% <0.00%> (+7.94%)	⬆️

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[asdine]

Thanks @tzzed ! Just one comment

[asdine]

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