Add schema.json for validating config yaml

[Kesin11]

We provide JSON schema for CIAnalyzer config yaml.
If user using vscode-yaml it enable validating their config yaml and given completion support from VSCode.

[codecov]

Codecov Report

Merging #675 (0edf53a) into master (11aa6d0) will increase coverage by 1.15%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #675      +/-   ##
==========================================
+ Coverage   39.27%   40.43%   +1.15%     
==========================================
  Files          27       28       +1     
  Lines        1166     1197      +31     
  Branches      223      224       +1     
==========================================
+ Hits          458      484      +26     
- Misses        689      694       +5     
  Partials       19       19              

Impacted Files	Coverage Δ
src/runner/circleci_runner_v1.ts	33.76% <ø> (ø)
src/runner/circleci_runner_v2.ts	38.35% <ø> (ø)
src/config/bitrise_config.ts	100.00% <100.00%> (ø)
src/config/circleci_config.ts	100.00% <100.00%> (ø)
src/config/config.ts	66.66% <100.00%> (ø)
src/config/github_config.ts	100.00% <100.00%> (ø)
src/config/jenkins_config.ts	100.00% <100.00%> (ø)

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[Kesin11]

ref: #635