[blueimp-load-image] extended type definitions for parseMetaData and blobSlice. (#37868)
[blueimp-load-image] extended type definitions for parseMetaData and blobSlice. (#37868)

* extended loadimagecallback with metadata argument.

* lint.

* extended unit test.

* cleanup test.

* polishing.

* added further type definitions for the blueimp-image-loader.

* merge.

* formatting.

* use interface instead of type definition.

* enhance export definition.

mcliment/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,dsebastien/DefinitelyTyped,georgemarshall/DefinitelyTyped,markogresak/DefinitelyTyped,dsebastien/DefinitelyTyped