feat: jsonschema

[caarlos0]

• adds a new jsonschema subcommand that generates the jsonschema for nfpm.yml
• adds some annotations to our structs so the schema is generated somewhat properly
• adds related docs

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[codecov]

Codecov Report

Merging #350 (c56520e) into master (a582b89) will decrease coverage by 1.31%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #350      +/-   ##
==========================================
- Coverage   66.20%   64.89%   -1.32%     
==========================================
  Files          13       14       +1     
  Lines        1237     1262      +25     
==========================================
  Hits          819      819              
- Misses        284      309      +25     
  Partials      134      134              

Impacted Files	Coverage Δ
internal/cmd/root.go	0.00% <0.00%> (ø)
internal/cmd/schema.go	0.00% <0.00%> (ø)
nfpm.go	86.20% <ø> (ø)

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[djgilcrease]

Will look at this tomorrow

[djgilcrease]

LGTM

[github-actions]

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