Issues/199: support Smpp Optional Tags in submit_sm

[komuw]

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Answer the following questions,

What(What have you changed?)

• Support Smpp Optional Tags in submit_sm

Why(Why did you change it?)

• Fixes: add support for Smpp Optional Tags #199

References:

[codecov-commenter]

Codecov Report

Merging #202 into master will decrease coverage by 0.12%.
The diff coverage is 67.85%.

@@            Coverage Diff             @@
##           master     #202      +/-   ##
==========================================
- Coverage   84.72%   84.60%   -0.13%     
==========================================
  Files          15       15              
  Lines        1532     1565      +33     
==========================================
+ Hits         1298     1324      +26     
- Misses        234      241       +7     

Impacted Files	Coverage Δ
naz/codec.py	97.91% <ø> (ø)
naz/state.py	87.93% <55.55%> (-12.07%)	⬇️
naz/client.py	80.99% <85.71%> (+0.23%)	⬆️
naz/protocol.py	82.06% <93.75%> (+11.82%)	⬆️

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