Reorganize cli

[asdine]

The cli package has been split into multiple sub packages to facilitate reuse of code between
the shell and the commands

[codecov-io]

Codecov Report

Merging #366 (5aeab7b) into main (106d82e) will decrease coverage by 0.18%.
The diff coverage is 69.64%.

@@            Coverage Diff             @@
##             main     #366      +/-   ##
==========================================
- Coverage   67.92%   67.74%   -0.19%     
==========================================
  Files          73       72       -1     
  Lines        7177     7201      +24     
==========================================
+ Hits         4875     4878       +3     
- Misses       1659     1667       +8     
- Partials      643      656      +13     

Impacted Files	Coverage Δ
db.go	48.05% <ø> (ø)
expr/arithmeric.go	92.30% <ø> (ø)
expr/comparison.go	73.56% <ø> (ø)
expr/env.go	37.93% <ø> (ø)
expr/expr.go	20.58% <ø> (ø)
expr/function.go	7.07% <ø> (ø)
expr/like.go	0.00% <ø> (ø)
expr/literal.go	47.69% <ø> (ø)
expr/logical.go	11.76% <ø> (ø)
expr/operator.go	20.00% <ø> (ø)
... and 40 more

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