feat(common): support for diagnostic reports v2; closes #92

[boneskull]

• adds a schema file
• adds schema and d.ts to common package

[codecov[bot]]

Codecov Report

Merging #93 into master will decrease coverage by 1.60%. The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master      #93      +/-   ##
==========================================
- Coverage   87.70%   86.10%   -1.61%     
==========================================
  Files          51       51              
  Lines         911      914       +3     
==========================================
- Hits          799      787      -12     
- Misses        112      127      +15     

Impacted Files	Coverage Δ
packages/cli/src/commands/redact.js	47.05% <ø> (ø)
packages/cli/src/commands/transform.js	100.00% <ø> (ø)
packages/common/src/constants.js	100.00% <ø> (ø)
packages/common/src/redact.js	100.00% <ø> (ø)
packages/core/src/observable.js	90.16% <ø> (ø)
packages/fs/src/fs-report-loader.js	100.00% <ø> (ø)
packages/inspector/src/index.js	100.00% <ø> (ø)
packages/inspector/src/rule-config.js	88.88% <ø> (ø)
packages/inspector/src/rule.js	95.16% <ø> (ø)
packages/inspector/src/rules/library-mismatch.js	100.00% <ø> (ø)
... and 6 more

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[boneskull]

unfortunately got roped into upgrading packages, and so needed to reformat stuff