Add "plus" methods for Tuples

[andrzejressel]

fixes #815

[pakoito]

This is too useful to make it throwaway code, we can modify it for other functions. It cannot be shipped with the library tho, can you please move it to...

...to where?

Can you create a folder in the root of the project called scripts and drop it there? Will it even work? How did you invoke it?

[raulraja]

Those scripts can live in the annotation processor which is not a runtime dependency

[pakoito]

Approved, of course :D Thanks for jumping into this!

[raulraja]

I think the generator can be moved to the annotation processor and what is generated either to Tuple in core or in a different syntax place that is not collections unless there is other tuple stuff there already.

[andrzejressel]

I don't think it should be in annotation processor - it doesn't process any annotation. I'll create a directory in root and write readme file how to use them - in future we could create gradle task for that.

[codecov]

Codecov Report

Merging #818 into master will decrease coverage by 0.11%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master     #818      +/-   ##
============================================
- Coverage     44.29%   44.17%   -0.12%     
  Complexity      617      617              
============================================
  Files           289      290       +1     
  Lines          7376     7396      +20     
  Branches        828      828              
============================================
  Hits           3267     3267              
- Misses         3810     3830      +20     
  Partials        299      299

Impacted Files	Coverage Δ	Complexity Δ
.../src/main/kotlin/arrow/syntax/collections/tuple.kt	0% <0%> (ø)	0 <0> (?)

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