Revert "Merge pull request #14 from wso2-dev/revert-12-revert-10-CARBON-14867"

This reverts commit a0ce2c3f788a11492e1bbddc1b2ca3216079b23b, reversing
changes made to 3b71161a389276b57a25b5a5bd213a37a7a678b7.
Integrating rat and adding licence headers