GitLab

**Description**
Add md and html output format for DataDiagnosis.

**Major Revision**
- add md and html support in file_handler
- add interface in DataDiagnosis for md and HTML output

**Minor Revision**
- move excel and json output interface into DataDiagnosis

**Description**
Add basic analysis features.

**Major Revision**
- Add statistics, correlations of the raw data
- Add numeric outlier detection(inter_quartile_range)
- Add boxplot for selected metric