Align last line of skeleton view according to text alignment

[literallysofia]

Summary

As mentioned in issue 428, it would be nice to have the possibility to align the last line of multiline skeleton views (when not filling 100%) according to their text alignment property. This pull request proposes a solution where given the property textAlignment, the rectangle that represents the last line of a multiline layer is positioned accordingly. Only .center and .right alignments are taken into account, the fallback will always be to align left.

Requirements (place an x in each of the [ ])

• [x] I've read and understood the Contributing guidelines and have done my best effort to follow them.
• [x] I've read and agree to the Code of Conduct.

[Juanpe]

🚀 Thanks for contributing! 🤙

[Juanpe]

Congratulations! 🎉 This was released as part of SkeletonView 1.22.0 🚀