Feature: High level aggregated CSV download for sitemaps.

[amovar18]

Description

This PR aims to allow users to download aggregated CSV data when analysing a sitemap.

Relevant Technical Choices

• A new function to generate aggregated CSV has been introduced to calculate the aggregated data of the sitemap.

Testing Instructions

• Clone this branch
• In the terminal run npm run build:cli:dashboard.
• Then run analysis on a sitemap.
• After analysis is done, open the report and download the report from sitemap landing page.
• You should see a report.csv in the zip file, which will contain the data of the landing page.

Additional Information:

Screenshot/Screencast

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Checklist

• I have thoroughly tested this code to the best of my abilities.
• I have reviewed the code myself before requesting a review.
• This code is covered by unit tests to verify that it works as intended.
• The QA of this PR is done by a member of the QA team (to be checked by QA).

Fixes #809

[mohdsayed]

Looks good.