feat: add `list` command

[codecov[bot]]

Codecov Report

Merging #7 (1076987) into main (736bf3e) will increase coverage by 1.80%. The diff coverage is 71.00%.

@@            Coverage Diff             @@
##             main       #7      +/-   ##
==========================================
+ Coverage   75.00%   76.80%   +1.80%     
==========================================
  Files          15       17       +2     
  Lines         376      444      +68     
==========================================
+ Hits          282      341      +59     
- Misses         65       71       +6     
- Partials       29       32       +3     

Impacted Files	Coverage Δ
internal/ebpf/drop.go	62.50% <0.00%> (ø)
internal/ebpf/undrop.go	43.75% <0.00%> (ø)
cmd/durdur/helpers.go	66.66% <66.66%> (ø)
cmd/durdur/list.go	75.51% <75.51%> (ø)
internal/ebpf/list.go	79.31% <79.31%> (ø)
cmd/durdur/main.go	75.00% <100.00%> (+1.66%)	:arrow_up:
internal/ebpf/helpers.go	100.00% <100.00%> (ø)
internal/ebpf/testing.go	91.66% <100.00%> (-0.27%)	:arrow_down:

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