feat(core): separate core functionalty out of watson sdk

[mamoonraja]

port core functionality from ibm_cloud_sdk_core

[mediumTaj]

👍 looks good!

[codecov-io]

Codecov Report

Merging #58 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master    #58    +/-   ##
======================================
  Coverage     100%   100%            
======================================
  Files          20     16     -4     
  Lines        2603   2334   -269     
======================================
- Hits         2603   2334   -269

Impacted Files	Coverage Δ
lib/ibm_watson/speech_to_text_v1.rb	100% <100%> (ø)	⬆️
lib/ibm_watson/assistant_v2.rb	100% <100%> (ø)	⬆️
lib/ibm_watson/discovery_v1.rb	100% <100%> (ø)	⬆️
...ib/ibm_watson/natural_language_understanding_v1.rb	100% <100%> (ø)	⬆️
lib/ibm_watson/text_to_speech_v1.rb	100% <100%> (ø)	⬆️
lib/ibm_watson/natural_language_classifier_v1.rb	100% <100%> (ø)	⬆️
lib/ibm_watson/language_translator_v3.rb	100% <100%> (ø)	⬆️
lib/ibm_watson/common.rb	100% <100%> (ø)	⬆️
lib/ibm_watson/personality_insights_v3.rb	100% <100%> (ø)	⬆️
lib/ibm_watson/tone_analyzer_v3.rb	100% <100%> (ø)	⬆️
... and 3 more

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[mediumTaj]

👍 looks good!

[watson-github-bot]

🎉 This PR is included in version 0.14.0 🎉

The release is available on GitHub release

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