Migrate GitHub package to Gradle Project

[AzeemMuzammil]

Description

$title.

Fixes # (issue)

Related Pull Requests (remove if not relevant)

• Pull request 1
• Pull request 2

One line release note:

• One line describing the feature/improvement/fix made by this PR

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Test A
• Test B

Test Configuration:

• Ballerina Version:
• Operating System:
• Java SDK:

Checklist:

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines?
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets?

[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (263c849) 76.51% compared to head (db6628d) 76.15%.
Report is 25 commits behind head on master.

Files	Patch %	Lines
ballerina/utils.bal	87.50%	5 Missing ⚠️
ballerina/gists.bal	85.71%	2 Missing ⚠️
ballerina/repositories.bal	85.71%	2 Missing ⚠️
ballerina/topics.bal	85.71%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #287      +/-   ##
==========================================
- Coverage   76.51%   76.15%   -0.37%     
==========================================
  Files          12       14       +2     
  Lines        1827     1921      +94     
  Branches      895      948      +53     
==========================================
+ Hits         1398     1463      +65     
- Misses        429      458      +29     

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