Add labelOffset to XAxis props

[kristw]

🏆 Enhancements

• Add labelOffset to XAxis props. Use default value of 14 from the underlying vx.

[codecov]

Codecov Report

Merging #169 into master will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #169      +/-   ##
==========================================
- Coverage   80.55%   80.51%   -0.05%     
==========================================
  Files         109      109              
  Lines        2422     2422              
  Branches      568      568              
==========================================
- Hits         1951     1950       -1     
  Misses        291      291              
- Partials      180      181       +1

Impacted Files	Coverage Δ
packages/xy-chart/src/axis/XAxis.jsx	100% <ø> (ø)	⬆️
packages/xy-chart/src/chart/XYChart.jsx	76.51% <0%> (-0.76%)	⬇️

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[williaster]

LGTM, test coverage change isn't a huge issue/we don't test this in YAxis either rn.