sourcemaps: Supporting changes for the JS source maps

[manojVivek]

Contains:

• Debug info server can handle SOURCE_MAP files.
• Profile store read and write paths accept source column info in the location data.

[alwaysmeticulous]

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_{Expected differences? Click here. Last updated for commit c07ece7. This comment will update as new commits are pushed.}

[CLAassistant]

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