feat(cli): Implement completion for flags and arguments

[irvinlim]

Supports auto-completion of arguments and flags for all commands:

• -n/--namespace: Autocompletes based on list of namespaces.
• -o/--output: Autocompletes list of output formats.
• Autocompletes Job/JobConfig names.

Side note: The above GIF was generated with https://github.com/charmbracelet/vhs

[codecov]

Codecov Report

Base: 64.57% // Head: 64.22% // Decreases project coverage by -0.35% ⚠️

Coverage data is based on head (2efdaf8) compared to base (48cc689).
Patch coverage: 47.36% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #106      +/-   ##
==========================================
- Coverage   64.57%   64.22%   -0.36%     
==========================================
  Files         205      207       +2     
  Lines       10963    11079     +116     
==========================================
+ Hits         7079     7115      +36     
- Misses       3505     3574      +69     
- Partials      379      390      +11     

Impacted Files	Coverage Δ
apis/execution/v1alpha1/jobconfig_types.go	100.00% <ø> (ø)
pkg/cli/cmd/completion.go	22.22% <22.22%> (ø)
pkg/cli/cmd/common.go	44.59% <25.00%> (-4.62%)	⬇️
pkg/cli/cmd/completion_helper.go	25.00% <25.00%> (ø)
pkg/cli/cmd/cmd.go	86.95% <40.00%> (-5.73%)	⬇️
pkg/cli/cmd/cmd_get.go	84.21% <40.00%> (-15.79%)	⬇️
pkg/cli/cmd/cmd_list.go	84.21% <40.00%> (-15.79%)	⬇️
pkg/cli/cmd/cmd_list_job.go	80.00% <40.00%> (-2.11%)	⬇️
pkg/cli/cmd/cmd_run.go	75.56% <70.00%> (-0.91%)	⬇️
pkg/cli/cmd/cmd_disable.go	73.68% <100.00%> (+0.46%)	⬆️
... and 4 more

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