tree-wide: add support for ABAP Structures CRUD

[buca92]

• Unit test for sapcli structures support created
• Documentation for sapcli structures provided

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (b9ba9aa) 98.25% compared to head (f45020b) 98.25%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #119   +/-   ##
=======================================
  Coverage   98.25%   98.25%           
=======================================
  Files          82       84    +2     
  Lines        8298     8315   +17     
=======================================
+ Hits         8153     8170   +17     
  Misses        145      145           

Files Changed	Coverage Δ
sap/adt/__init__.py	100.00% <100.00%> (ø)
sap/adt/structure.py	100.00% <100.00%> (ø)
sap/cli/__init__.py	90.21% <100.00%> (+0.10%)	⬆️
sap/cli/structure.py	100.00% <100.00%> (ø)

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[jfilak]

Well done! Thank you.