Feature: Add i18n module

[mayan-000]

Description

This PR adds the i18n module which exports the Singleton class for handling the request for text translation and parsing the substitutions accordingly.

Relevant Technical Choices

• Introduce a new i18n package for exporting the class for handling the request for text translation and parsing the substitutions accordingly.
• Create _locales file in i18n package, and have translation of each package, eg. _locales/cli/messages.json
• Add script to merge package's json file into _locales/en/messages.json file
• Write scripts to extract translatable text from files like open-cookie-database.json, PSInfo.json, related_website_sets.json and merge with a single message.json.

Below pointers will be taken care in upcoming PRs

• Use translation functions in all package like design-system, common, extension, library-detection, cli-dashboard
• Get translation done for all required languages.
• Handle new changes and string updation.
• Add testcases for functionality.

Testing Instructions

• This PR only adds i18n infrastructure, it doesn't implement any functions of i18n module.
• The only testing this PR need is that all functionality is working without any breakage.

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 #566