Move class definitions outside package objects

[RustedBones]

Class defined in package object create the following warning:

[warn] ...it is not recommended to define classes/objects inside of package objects.
[warn] If possible, define class xxx in package types instead

Moved the class definition outside the package object.

implicit value classes were not affected by warning but to increase consistency across all modules, I created a syntax package and a deprecated type alias in case the value class was used explicitly

[codecov]

Codecov Report

Attention: 33 lines in your changes are missing coverage. Please review.

Comparison is base (1671db7) 63.34% compared to head (76ed9a9) 63.37%.

Files	Patch %	Lines
.../scio/extra/sparkey/syntax/SCollectionSyntax.scala	89.77%	9 Missing ⚠️
.../main/scala/com/spotify/scio/parquet/Parquet.scala	71.42%	8 Missing ⚠️
...fy/scio/extra/annoy/syntax/ScioContextSyntax.scala	0.00%	4 Missing ⚠️
...scala/com/spotify/scio/extra/sparkey/Sparkey.scala	82.60%	4 Missing ⚠️
...fy/scio/extra/annoy/syntax/SCollectionSyntax.scala	89.65%	3 Missing ⚠️
...ain/scala/com/spotify/scio/extra/annoy/Annoy.scala	77.77%	2 Missing ⚠️
.../scio/extra/sparkey/syntax/ScioContextSyntax.scala	66.66%	2 Missing ⚠️
...ify/scio/extra/json/syntax/ScioContextSyntax.scala	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5127      +/-   ##
==========================================
+ Coverage   63.34%   63.37%   +0.03%     
==========================================
  Files         291      298       +7     
  Lines       10840    10849       +9     
  Branches      753      733      -20     
==========================================
+ Hits         6867     6876       +9     
  Misses       3973     3973              

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[kellen]

@RustedBones did you end up doing this in another PR or am I hallucinating? if not, should we merge this for 0.14?

[RustedBones]

No this has never passed CI not been approved, and it's not required for 0.14.
I'm closing this one. Will do another pass to fix warnings later