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]

✅ Meticulous spotted 0 visual differences across 315 screens tested: view results.

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_{Expected differences? Click here. Last updated for commit 47cdfb8. This comment will update as new commits are pushed.}