Updates on configuration changes

Changes `sendCommandWithCompletion` to return a promise

* Add simple dropdown for hiding graph columns

* Fixed lint errors and cleaned the code

* Modified combobox list to show only the graph columns that can be hidden

* Refactoring: removed "getGraphColConfigModel" function

* Fixed ids/keys prefix used for the columns combo

Co-authored-by: Miggy Eusebio <miggy.eusebio@gitkraken.com>

Refs #2195

Doesn't yet fix the spinners sticking issue

Shows progress indicator while loading autolinks

Fixes progress indicators when loading new rows & other updates happen (e.g. avatars)

Loading the webview without the rows lets us provide feedback (spinners) while the rows are being loaded/processed and also parallelizes the webview initialization (react, component, etc) while git is working

Streams git log data to find specific commit