feat(semver): Allow for passing includeBuild into format method

[kamilogorek]

ref: #3110

[kt3k]

Should this be optional? How about showing the build metadata always?

[kamilogorek]

We cannot do that, as format() call is used for semver comparison, ref: #3110 (comment)

Also:

Although format itself is not pure function, so maybe an alternative just for printing would be preferable.

[justinmchase]

It may be wise to just adjust the .toString() function to return the version with metadata and leave the format function alone, for backwards compatibility reasons.

Also, it would be nice if there was a function which returned a new SemVer with the build set. since there is now way to apply build metadata to a version without doing string manipulation at the moment.

var v0 = semver.parse('1.2.3')
var v1 = v0.metadata('4')
console.log(v0.toString()) // 1.2.3
console.log(v1.toString()) // 1.2.3+4

[justinmchase]

I made a more complete version of this PR with some feedback from the discussion:

#3126

[kamilogorek]

Closed in favor of #3126