[Drop GMP v7, v8 and v9 support] Step 1: Duplicate the code from old versions into the v20.08 API

[y0urself]

What:

• Duplicating Types and API Calls from the versions 7, 8 and 9 into GMP 20.08
• Duplicate Tests of deprecated versions into GMP 20.08 tests

Why:

• Part One of Code Improvement of the python-gvm API

How:

Checklist:

• Tests
• CHANGELOG Entry
• Documentation

[codecov]

Codecov Report

Merging #436 (8efd04f) into master (0d53117) will increase coverage by 0.08%.
The diff coverage is 98.43%.

@@            Coverage Diff             @@
##           master     #436      +/-   ##
==========================================
+ Coverage   97.71%   97.79%   +0.08%     
==========================================
  Files          21       21              
  Lines        4683     7180    +2497     
==========================================
+ Hits         4576     7022    +2446     
- Misses        107      158      +51     

Impacted Files	Coverage Δ
gvm/protocols/gmpv208/gmpv208.py	97.97% <ø> (-2.03%)	⬇️
gvm/protocols/gmpv208/types.py	98.81% <98.43%> (-1.19%)	⬇️

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