* Add QR code scanner widget
This commit adds QR code scanner widget which
* Displays a viewfinder that can be activated or deactivated
* Exposes a variable named lastDetectedValue which holds the
data contained in the last QR code it was able to scan
* Defines an event onDetect which is fired whenever a QR code
is successfully scanned
* Add documentation for QR scanner widget
* Supply missing newline
* Supply missing newline for qrscanner.svg
* Supply missing newlines and semicolons
* Update error modal content
* Remove `active` property from QrScanner
* Add blob: to content security policy
* Disable content security policy
* Add content security policy that allows self, unsafe-eval and blob
* Feature: Add GraphQL data sources
* Querying graphql
* use graphlient gem to talk to a graphql datasource
* use the source headers and params while initializing the graphql-client
* remove unnecessary body field from the graphql source addition modal
* add documentation for graphql datasource setup
Co-authored-by: navaneeth <navaneethpk@outlook.com>
