feat(axis): Add x.tick.text.inner option

[netil]

Issue

#3552

Details

Implement tick text inner option

axis: {
  x: {
    tick: {
      text: {
         inner: true

         // or specify each position of the first and last tick text
         inner: {
           first: true,
           last: true
         }
      }
    }
  }
}

[coveralls]

coverage: 94.381% (+0.008%) from 94.373%
when pulling 632a383 on netil:axis#3552
into 6f052e1 on naver:master.