[add] parameter pad to tick-format.linear

[Mc-Zen]

Can be used via

#show: lq.set-diagram(
  xaxis: (format-ticks: lq.tick-format.linear.with(pad: false)),
)

#lq.diagram()

In the future there might be a settable element that allows setting such values like set lq.tick.format.args(pad: false) which would be useful so that the formatter can stay auto and may adapt the current scale (i.e. pick the log formatter when the axis is logarithmic).

Closes #126.