Better CLI completion

[nt0xa]

Now all commands that accept -p PAYLOAD flag have completions.
Also flags like 'dns new --typeandhttp new --method` and others.

[codecov]

Codecov Report

Attention: Patch coverage is 86.36364% with 6 lines in your changes missing coverage. Please review.

Project coverage is 72.93%. Comparing base (8c54703) to head (d225a37).

Files	Patch %	Lines
internal/modules/api/generated.go	25.00%	0 Missing and 3 partials ⚠️
internal/cmd/cmd.go	94.73%	1 Missing ⚠️
internal/cmd/messengers.go	0.00%	1 Missing ⚠️
internal/cmd/options.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #171      +/-   ##
==========================================
+ Coverage   72.45%   72.93%   +0.47%     
==========================================
  Files          64       64              
  Lines        3870     3857      -13     
==========================================
+ Hits         2804     2813       +9     
+ Misses        822      802      -20     
+ Partials      244      242       -2     

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