Cleanup HttpClient

[iNoles]

Description

HttpClient deserve to be refracting with many areas. As for Hook, InputStream is now nullable. I am moving httpExchangeFailed to the different area. I added the connect() to make sure it is connected. I am planning to add more later on.

Type of change

Check all that apply

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactoring (a change which changes the current internal or external interface)
• This change requires a documentation update

How Has This Been Tested?

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changes, with instructions so we can reproduce. If you have added comprehensive
tests for your changes, you may omit this section.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation, if necessary
• My changes generate no new compiler warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Inspect the bytecode viewer, including reasoning why

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@5cc452c). Click here to learn what that means.
The diff coverage is 54.16%.

@@            Coverage Diff            @@
##             master     #639   +/-   ##
=========================================
  Coverage          ?   71.39%           
  Complexity        ?      297           
=========================================
  Files             ?       57           
  Lines             ?     1489           
  Branches          ?      192           
=========================================
  Hits              ?     1063           
  Misses            ?      334           
  Partials          ?       92

Impacted Files	Coverage Δ	Complexity Δ
...ava/com/github/kittinunf/fuel/stetho/StethoHook.kt	45.45% <ø> (ø)	0 <0> (?)
...in/kotlin/com/github/kittinunf/fuel/core/Client.kt	0% <ø> (ø)	0 <0> (?)
...tlin/com/github/kittinunf/fuel/core/DefaultHook.kt	100% <100%> (ø)	2 <1> (?)
...in/com/github/kittinunf/fuel/toolbox/HttpClient.kt	76.85% <52.17%> (ø)	29 <3> (?)

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[kittinunf]

This looks like it is good to go, right? 😄

[iNoles]

@SleeplessByte it is ready to merge with your suggestions.

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