chartjs / Chart.js / 4087

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Avoid tooltip truncation in x axis if there is enough space (#3998)

* In tooltip x align calculation take into account caretSize

Truncation up to caretSize pixels could happen if label text produced tooltip element with size width:
* left side tooltip: width < x and width > x - caretSize
* right side tooltip: width < chartWidth - x and width > chartWidth - x - caretSize
Default caretSize = 5, so with default configuration truncation up to 5 pixels could happen.

* avoid tooltip truncation if possible
use whole chart area for displaying tooltip

* in xAlign calculation take into account caretPadding

* add tests for tooltip truncation avoid logic

* use caretX instead of xCaret

* fix lint errors

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