Added Set to Types

[kasvith]

Pull Request for issue #6

Description

Added Set Data structure.
The underlying DS is a Map data structure

Capabilities

• New - Creates a new set
• NewFromSlice - Create a new set from a given string slice
• Add - Adds items to a set
• Card - Cardinality of the set
• Elems - Get all elements of the set
• Diff - Set difference given as a slice of strings
• DiffS - Set difference given as a Set
• Exists - Check a given element exists on the set
• Delete - Delete elements from the set
• Intersection - Intersection the sets and return a slice of string
• IntersectionS - Intersection the sets and return a set
• Union - Get the union of given sets, a string slice returned
• UnionS - Get the union of given sets, a Set returned
• Move - Move an element from one set to another

Testing Instructions

• Run go test ./...

Additional Comments

• Need to implement Pop and RandomElement

[codecov]

Codecov Report

Merging #7 into master will increase coverage by 0.3%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master       #7     +/-   ##
=========================================
+ Coverage   99.13%   99.43%   +0.3%     
=========================================
  Files           2        3      +1     
  Lines         230      353    +123     
=========================================
+ Hits          228      351    +123     
  Misses          2        2

Impacted Files	Coverage Δ
internal/types/set/set.go	100% <100%> (ø)

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