Re: [pgAdmin][RM6131] Port query tool to React

Hi Hackers,

Attached is the initial patch that migrates the SQL Editor tool to React based. Change highlights:
1. Complete rewrite to React code.
2. UI improvements based on suggestions and requests.
3. Work towards stability and performance improvement.
4. Keep row numbers in view when scrolling horizontally. Fixes #3989
5. Fixed status bar at the bottom with useful details. Fixes #3253
6. Relocate GIS Viewer Button to the Left Side of Results Table. Fixed #6830
7. Allow to remove single history records. Refs #4113
8. Macros usability improvements. Ref #6969
9. Connection bar visibility issue. Fixes #7188
10. Query tool layout issues. Fixes #6725

Please note, there are still few minor niggles at some places but the patch qualified to be reviewed. We will need a good amount of time to test this properly. So, I am sending the feature patch. JS test cases and documentation patches will follow soon. 

Please review.

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Thanks,

Aditya Toshniwal

pgAdmin Hacker | Software Architect | edbpostgres.com

"Don't Complain about Heat, Plant a TREE"