slices: implement common utility functions for cardinality, transformation, filtering and venn operations

[sinhashubham95]

This PR enhances the slices package by adding the essential functions around cardinality, transformation, filtering and venn operations which are as follows.

• Cardinality
• CardinalityFunc
• CardinalityMap
• Transform
• Filter
• Disjunction
• Intersection
• Union
• Subtract

These new functions added, are the common functions available in a lot of languages like Java, Python, etc in their standard packages, and are used very commonly in Go based applications, though implemented repeatedly everywhere.

Implementing these functions provides robustness and reliability around such use cases. Each of these functions handles for nil or empty slices, instead of a panic in such scenarios.

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Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Message from Shubham Sinha:

Patch Set 1:

(1 comment)

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Message from Ian Lance Taylor:

Patch Set 1: Hold+1

(1 comment)

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This PR (HEAD: 99c0950) has been imported to Gerrit for code review.

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