Add minimum DPF version logic to examples

[PProfizi]

Managing the minimal DPF version required to run an example is necessary to be able to continue CI/CD with continuous integration of examples and features only available on the DPF server currently under development, but not yet in the one already out.
For now, this is specified with a note in the header of the example, stating for example:

.. note::
   This example requires DPF 6.1 or above.
   For more information, see :ref:`ref_compatibility`.

The two digits version number is used, however I think we could use the DPF Server package version if we wanted to.

See docs job as well as examples job for the 2023.2.pre0 server.

[codecov]

Codecov Report

Merging #783 (a173e32) into master (5a92a48) will increase coverage by 0.21%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #783      +/-   ##
==========================================
+ Coverage   88.64%   88.86%   +0.21%     
==========================================
  Files          72       72              
  Lines        8157     8180      +23     
==========================================
+ Hits         7231     7269      +38     
+ Misses        926      911      -15     

[PProfizi]

Tested locally and works for gallery generation, like here with 00-basic_example.py declared as requiring 6.2 in a note: