[Feature Request] Make it easier to change the position of the labels drawn above the circles in a LineChartView

There is currently no easy way to change this without changing the source code. It would be great if the library provided an easy way to change the label positions.

See the following Stackoverflow question for a solution that is not optimal:
https://stackoverflow.com/questions/44910889/change-position-of-labels-to-be-inside-data-set-circles/44931078

Start by inspecting LineChartView and the existing label-drawing path to understand how labels are positioned above circles. Use the linked Stack Overflow question as context for the desired flexibility. Done means the library exposes an easy way to change label positions without source changes and the behavior is verified across the relevant chart cases.

Written by the indexing model from the issue text.