Extend from Yaml Parser from Core Parser

[zarthross]

Extending from io.circe.Parser adds some convenience methods to the io.circe.yaml.Parser out of the box, such as decodeAccumulating.

The io.circe.yaml.Parser class already matches the io.circe.Parser interface.

Also added decode and friends to the io.circe.yaml.parser package manually as well (using the io.circe.Parser trait had some compilation issues)

supersedes #284

[codecov-commenter]

Codecov Report

Base: 91.66% // Head: 87.30% // Decreases project coverage by -4.36% ⚠️

Coverage data is based on head (e565d6d) compared to base (9822247).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #338      +/-   ##
==========================================
- Coverage   91.66%   87.30%   -4.37%     
==========================================
  Files           5        5              
  Lines         120      126       +6     
  Branches        7        6       -1     
==========================================
  Hits          110      110              
- Misses         10       16       +6     

Impacted Files	Coverage Δ
src/main/scala/io/circe/yaml/Parser.scala	89.09% <0.00%> (-3.37%)	⬇️
src/main/scala/io/circe/yaml/parser/package.scala	37.50% <0.00%> (-12.50%)	⬇️

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