feat: add DependencyMetric and NpmScope

[francinelucca]

Closes #51
Closes #37

Changelog

New

• DependencyMetric class and Unit tests
• NpmScope class and Unit tests
• new getPackageDependencies util and Unit tests. uses exec to get dependencies and devDependencies from package.json depending on the type param
• Added Unit tests for Scope

Changed

• Refactored Scope class' capture method to log to logger instead (this is temporary as this method is not fully implemented yet)

Testing / reviewing

• Tests should pass a sniff test and there should be no failures.
• add await new NpmScope(new Logger('./log.log')).run() to the bottom of the npm-scope.ts file, build the project and then node dist/main/scopes/npm/npm-scope.js and you should see the logs for each of the current dependencies and devDependencies in the project logged to the new log file

TODO

• Write tests for new functions
• Rewrite test for NPMScope
• Confirm getInstallingPackages function and NpmScope run with Joe