Fixes #353 Removed Create* prefix from request payloads

[OlenaVyshnevska]

Renamed:

1. 'CreateJobRunRequest' class to 'JobRunRequest'
2. 'CreateNamespaceReques' class to 'NamespaceRequest'

Modified all occurrences of the above classes to use new names.

[codecov]

Codecov Report

Merging #359 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##             master    #359   +/-   ##
========================================
  Coverage      77.2%   77.2%           
  Complexity      398     398           
========================================
  Files            91      91           
  Lines          1044    1044           
  Branches         50      50           
========================================
  Hits            806     806           
  Misses          172     172           
  Partials         66      66

Impacted Files	Coverage Δ	Complexity Δ
.../java/marquez/api/resources/NamespaceResource.java	96.42% <ø> (ø)	6 <0> (ø)	⬇️
...c/main/java/marquez/api/resources/JobResource.java	88.09% <ø> (ø)	20 <0> (ø)	⬇️
...n/java/marquez/api/mappers/NamespaceApiMapper.java	100% <ø> (ø)	3 <0> (ø)	⬇️
...main/java/marquez/api/models/NamespaceRequest.java	80% <ø> (ø)	4 <0> (?)
...rc/main/java/marquez/api/models/JobRunRequest.java	83.33% <ø> (ø)	5 <0> (?)

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[wslulciuc]

This looks great! Thanks for the quick patch, @OlenaVyshnevska.