[feat] Support justify alignment

[nam-hle]

This PR adds the justify alignment feature (#167). The solution is to calculate the number array of adding spaces, which has a length that is equal to the number of continuous space sequences and has a sum is equal to the available width. To be prettier, the array should be a non-decreasing one, and the difference between the maximum and minimum value is not greater than 1.

Example with total width = 10:

alignString('a b c')     = 'a    b   c'
alignString('a b c d')   = 'a  b  c  d'
alignString('a b c d e') = 'a  b c d e'

The issue is when the string is too short (e.g., the last line of a paragraph), I propose to fallback to left align if we have to add more than 03 spaces in one place (instead of calculating more information about the surrounding lines). So:

alignString('a b c', 11, 'justify')     = 'a    b    c'
alignString('a b c', 12, 'justify')     = 'a b c       '

Here is the demo from moonMission file with justify the last column:

[coveralls]

Pull Request Test Coverage Report for Build 330

• 19 of 19 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 325:	0.0%
Covered Lines:	363
Relevant Lines:	363

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💛 - Coveralls

[gajus]

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[gajus]

🎉 This PR is included in version 6.6.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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