Allow Annotations to have different formats

[Fellow-Bennse]

Explanation

(on FreeText)
Right now, the /DS and /DA created from pypdf looks something like:
'/DA': '0.9333333333333333 0.9333333333333333 0.9333333333333333 rg'
'/DS': 'font: Helvetica 44pt5pt;text-align:left;color:#0000f5'

The "Problem" is, that many Browsers/Programs have struggles reading this specific format.
From what I tested (and seen from programs/browser-addons), a (so called) Stream-Format seems to be a more "universal" format to be used. Also, it does not use /DS at all.
Example:
'/DA': '/Helv 10.5 Tf 0 Tc 11.76 TL 0 0.470588 0.831373 rg '

Would be cool if there could be some "Format-Change" or Converter added to pypdf.