[sankey-vis] Add Multi Filtering

* Add enable/disable drag-and-drop

# Support for 8.12 and improved visual styles (#40)

Added percentage to hover tooltips, in nodes and links
Removed node strokes borders
Highlight the set of links coming from a node

Co-authored-by: Oscar Quinde <[email protected]>

[sankey-vis] Update to 8.9 & 8.10 (#38)

Co-authored-by: Bassem Chagra <[email protected]>

Update the Kibana's Supported Versions

Upgrade to 8.3.x

[sankey]Update 7.15.x . (#21)

* [sankey][7.15.0] Beta Version

* [sankey][7.15.0] Add Inspect Data Feature

[sankey][7.15.0] Beta Version

[sankey][7.10.2] Update the Plugin to Kibana's new Platform

[sankey] Fix Broken Sorting for the Nodes (#17)

Co-authored-by: Bassem Chagra <[email protected]>

[sankey] Fix Broken Functionalities: (#16)

* Sankey-path is not visible with gardient
* Visualisation's data are not shown in the Inspection window
* Code Refactoring

Co-authored-by: Bassem Chagra <[email protected]>