Enhancement: Automatically generate release body

[localheinz]

This pull request

• automatically generates a release body

Follows ergebnis/php-package-template#874.

[codecov]

Codecov Report

Merging #643 (ae6a750) into main (b56423a) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #643   +/-   ##
=========================================
  Coverage     99.03%   99.03%           
  Complexity      145      145           
=========================================
  Files            32       32           
  Lines           519      519           
=========================================
  Hits            514      514           
  Misses            5        5           

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