Support for local csv file as input

[CannedFish]

In some scenarios, such as parameter tuning, it is not necessary to obtain relevant statistics through the network every time. This PR help to support batch reading statistics from local csv files.

Usage as follows:

usage: criticality_score [-h] (--repo REPO | --local-file L_FILE) [--format {default,csv,json}]
                         [--params PARAMS [PARAMS ...]]

Gives criticality score for an open source project

optional arguments:
  -h, --help            show this help message and exit
  --repo REPO           repository url
  --local-file L_FILE   path of a local csv file with repo stats
  --format {default,csv,json}
                        output format. allowed values are [default, csv, json]
  --params PARAMS [PARAMS ...]
                        Additional parameters in form (<value>|<key>):<weight>:<max_threshold>, <value> for repo, and
                        <key> for loacl file

Here is an example:

# cat python_top_2.csv
name,artifacts,url,language,created_since,updated_since,contributor_count,org_count,commit_frequency,recent_releases_count,updated_issues_count,closed_issues_count,comment_frequency,dependents_count,criticality_score,idc,bc,cc
salt,salt@3004,https://github.com/saltstack/salt,Python,120,0,3636,7,62.6,21,1641,679,1.1,20974,0.87814,6.436596945448553e-05,3.4932693324662978e-06,1.0844059851056442e-19
core,[email protected],https://github.com/home-assistant/core,Python,89,0,2520,9,162.7,205,5330,3786,3.5,380,0.87147,1.2873193890897107e-05,6.431467681977665e-06,0.12111046542342438

# criticality_score --local-file python_top_2.csv --format csv --params idc:1.5:0.1 bc:1.5:0.01 cc:0.5:1
name,artifacts,url,language,created_since,updated_since,contributor_count,org_count,commit_frequency,recent_releases_count,updated_issues_count,closed_issues_count,comment_frequency,dependents_count,criticality_score,idc,bc,cc
salt,salt@3004,https://github.com/saltstack/salt,Python,120,0,3636,7,62.6,21,1641,679,1.1,20974,0.62214,6.436596945448553e-05,3.4932693324662978e-06,1.0844059851056442e-19
core,[email protected],https://github.com/home-assistant/core,Python,89,0,2520,9,162.7,205,5330,3786,3.5,380,0.62426,1.2873193890897107e-05,6.431467681977665e-06,0.12111046542342438

[calebbrown]

Thanks for this change. I ripped the score logic out into a separate file and did the csv processing in there, but this helps keep it all together.

FYI: See #108 on the future direction I have in mind for this project.

[calebbrown]

This looks great!

I have one minor comment, but otherwise this is ready to go.

[CannedFish]

Hi @calebbrown , I have resolved conflicts, please review again. Thanks.