Add a script to download and install the latest version

[duncanpo]

Make the download and install process as easy as possible. Something like:

websave(fullfile(tempdir,"otel.mltbx"), "https://github.com/mathworks/OpenTelemetry-MATLAB/releases/latest/download/otel-matlab.mltbx"); matlab.addons.install(fullfile(tempdir,"otel.mltbx"));