Allow variadic arguments

[spinillos]

When we have list of a single type (string, integer, etc), we are setting the array as signature. It implies that the function argument needs an array initialisation to make it works, when we could simplify the API changing it for variadic arguments.

Go:

// Signatures

// Before
func Tags(tags []string) {...}

// After
func Tags(tags ...string) {...}

// Usage

// Before
Tags([]string{"tag1", "tag2"})

// After
Tags("tag1", "tag2")

TS:

// Signatures

// Before
tags(tags: string[]) {...}

// After
tags(...tags: string[]) {...}

// Usage

// Before
tags(['tag1', 'tag2'])

// After
tags('tag1', 'tag2')

[julienduchesne]

Two questions about this:

• Should this be gated by a veneer or should we change every array that is the last argument?
• What's the expectation of retrocompatibility? If this change is made, places where builder functions are called with arrays will not work on the functions that take in variadic arguments

[julienduchesne]

Will do it with a veneer