get Breadcrumbs
Returns the current buffer of breadcrumbs that will be sent with captured events. This ordered list represents the most recent breadcrumbs to be captured up to the limit set in getMaxBreadcrumbs.
The returned collection is readonly and mutating the list will cause no effect on the Client's state. If you wish to alter the breadcrumbs collected by the Client then you should use setEnabledBreadcrumbTypes and addOnBreadcrumb instead.
Return
a list of collected breadcrumbs