Implement Code Duplication Analysis in CodeChecker

[dkrupp]

Is your feature request related to a problem? Please describe.
CodeChecker should be able to execute the anlaysis of well known open source code-duplicate detection tools such as:

• https://github.com/platisd/duplicate-code-detection-tool
• CCfinder
• CloneDR
  See this overview study: https://par.nsf.gov/servlets/purl/10203750
  Evaluate the tools based on the supported languages, clone detection efficiency, develepment/open source community activity.

Suggested Implementation Steps

1. Investigate a potential Code Duplicate Detection tool to be supported
2. Implement a Report Converter tool which converts the Duplicate detection anlaysis results to CodeChecker (plist) format. For inspiration see the other report converter tools: https://github.com/Ericsson/codechecker/tree/master/tools/report-converter
3. Implement an analysis executor for the report converter tool such as: https://github.com/Ericsson/codechecker/tree/master/analyzer/codechecker_analyzer/analyzers