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Implement code coverage heat map (#145)

- Add `--coverage` CLI argument and `coverage` API option to pass coverage JSON file produced by Chrome
- Calculate covered mapping ranges' sizes
- Implement tree data heat map coloring depending on coverage percent
- [ESLint] Require empty line after `const`/`let`
- [ESLint] Enable `object-shorthand`
- Put code coverage related methods to `coverage.ts`
- Add `CannotOpenCoverageFile` and `NoCoverageMatches` errors
- Replace `FileSizeMap` with `FileData` so that additional data can be stored along with mapping size
- Implement mapping coverages to bundles by comparing coverage URL with bundle name.
- Convert coverage ranges (one-line) to per line range to ease matching with mapping ranges
- When calculating file sizes first get mapping ranges with sources, then merge consecutive ranges and then calculate bytes
- Fix bytes calculation - get bytes length from source ranges' string rather than columns count. One column can have byte length 4 bytes (e.g. 🍰)
- Move mapping reference EOL check before invalid mapping column check
- Add `rewiremock` to mock dependencies during tests
- Add `mappedBytes` value to result

Co-authored-by: Nikolay Borzov <nikolay.n.borzov@gmail.com>

167 of 183 branches covered (91.26%)

Branch coverage included in aggregate %.

341 of 365 relevant lines covered (93.42%)

183.1 hits per line