Add HalApiClientBuilder and HalResponseRendererBuilder

[feffef]

HalApiClient and HalResponseRenderer already contained too many overloads of their create methods, and further overloads would be required for additional customisations without breaking backwards compatibility

[codecov]

Codecov Report

Merging #25 (be518a8) into develop (45adc39) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##           develop       #25   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          122       125    +3     
  Lines         3566      3636   +70     
  Branches       258       263    +5     
=========================================
+ Hits          3566      3636   +70     

Impacted Files	Coverage Δ
...avan/rhyme/api/common/RequestMetricsCollector.java	100.00% <ø> (ø)
...van/rhyme/api/server/VndErrorResponseRenderer.java	100.00% <ø> (ø)
...yme/impl/client/http/HttpUrlConnectionSupport.java	100.00% <ø> (ø)
...me/impl/reflection/CompositeHalApiTypeSupport.java	100.00% <ø> (ø)
...hyme/impl/reflection/HalApiTypeSupportAdapter.java	100.00% <ø> (ø)
.../testing/client/AbstractHalResourceLoaderTest.java	100.00% <ø> (ø)
...in/java/io/wcm/caravan/rhyme/api/RhymeBuilder.java	100.00% <100.00%> (ø)
.../io/wcm/caravan/rhyme/api/client/HalApiClient.java	100.00% <100.00%> (ø)
.../caravan/rhyme/api/client/HalApiClientBuilder.java	100.00% <100.00%> (ø)
...van/rhyme/api/server/AsyncHalResponseRenderer.java	100.00% <100.00%> (ø)
... and 16 more

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