Improve Go client

[vearutop]

Added

• Flag to not add field property for undefined additionalProperties in Go client.
• Flag to skip adding "DO NOT EDIT" comments in Go client.
• InstrumentCtxFunc context control in Go client.
• Response decoding error with body and extra information in Go client.

Fixed

• Redundant trailing / is removed from base url in Go client.
• Code style issues in Go client.
• Response with status No Content body decoding in Go client.

[codecov[bot]]

Codecov Report

Merging #11 into master will increase coverage by <.01%. The diff coverage is 81.35%.

@@             Coverage Diff              @@
##             master      #11      +/-   ##
============================================
+ Coverage     76.16%   76.16%   +<.01%     
- Complexity      359      367       +8     
============================================
  Files            25       26       +1     
  Lines          1313     1355      +42     
============================================
+ Hits           1000     1032      +32     
- Misses          313      323      +10

Impacted Files	Coverage Δ	Complexity Δ
src/Command/App.php	0% <ø> (ø)	1 <0> (ø)	:arrow_down:
src/Command/GoClient.php	38.88% <50%> (-2.78%)	3 <0> (ø)
src/Go/LiteralType.php	66.66% <66.66%> (ø)	3 <3> (?)
src/Go/Client/Client.php	79.46% <88.88%> (+0.56%)	92 <8> (+5)	:arrow_up:

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