Add public function to map a success task with another task publisher

[sebastianvarela]

PR's key points

Add an operator to map a successful task into another task publisher by passing the success value in order to use the given value to do a new subscription (For example: to fetch a keyed task by his key)

How to review this PR?

Test green? go br!
We can discuss these change on a meeting :)

[codecov]

Codecov Report

Attention: Patch coverage is 98.18182% with 9 lines in your changes missing coverage. Please review.

Project coverage is 93.99%. Comparing base (31907ca) to head (34f38d7).

Files	Patch %	Lines
Tests/PublishersTests+MapToLatestTask.swift	94.54%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #19      +/-   ##
==========================================
+ Coverage   93.80%   93.99%   +0.18%     
==========================================
  Files          40       45       +5     
  Lines        2180     2397     +217     
==========================================
+ Hits         2045     2253     +208     
- Misses        135      144       +9     

Flag	Coverage Δ
ios	93.99% <98.18%> (+0.32%)	⬆️
mac	93.99% <98.18%> (+0.18%)	⬆️
tv	93.99% <98.18%> (+0.32%)	⬆️

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[ThorBot]

	1 Warning
⚠️	Big PR, try to keep changes smaller if you can 😜

	6 Messages
📖	Mini-iOSTests: Executed 67 tests, with 0 failures (0 expected) in 11.291 (11.313) seconds
📖	Mini-macOSTests: Executed 67 tests, with 0 failures (0 expected) in 11.251 (11.274) seconds
📖	Mini-tvOSTests: Executed 67 tests, with 0 failures (0 expected) in 11.284 (11.3) seconds
📖	⌛️ [output] Slowest test: test_check_expiration_for_custom took 4.013 seconds
📖	⌛️ [output] Slowest test: test_check_expiration_for_custom took 4.005 seconds
📖	⌛️ [output] Slowest test: test_check_expiration_for_custom took 4.011 seconds

SwiftLint found issues

Warnings

File	Line	Reason
Dispatcher.swift	75	Returning Void in a function declaration is redundant (redundant_void_return)
None.swift	4	This default initializer would be synthesized automatically - you do not need to define it (unneeded_synthesized_initializer)
Publishers.CombineMiniTasksTuple3.swift	81	Opening braces should be preceded by a single space and on the same line as the declaration (opening_brace)
Publishers.CombineMiniTasksTuple3.swift	91	Opening braces should be preceded by a single space and on the same line as the declaration (opening_brace)
Publishers.CombineMiniTasksTuple4.swift	86	Opening braces should be preceded by a single space and on the same line as the declaration (opening_brace)
Publishers.CombineMiniTasksTuple4.swift	97	Opening braces should be preceded by a single space and on the same line as the declaration (opening_brace)
Publishers.CombineMiniTasksTuple2.swift	76	Opening braces should be preceded by a single space and on the same line as the declaration (opening_brace)
Publishers.CombineMiniTasksTuple2.swift	85	Opening braces should be preceded by a single space and on the same line as the declaration (opening_brace)
DispatcherTests.swift	12	Returning Void in a function declaration is redundant (redundant_void_return)
DispatcherTests.swift	13	Returning Void in a function declaration is redundant (redundant_void_return)
TestInterceptor.swift	26	Returning Void in a function declaration is redundant (redundant_void_return)

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