SpanGaps should allow Number

[dhelml]

Checklist

• I am able to reproduce the bug with the latest version
• I made sure that there are no existing issues - open or closed - which I could contribute my information to.
• I have taken the time to fill in all the required details. I understand that the bug report will be dismissed otherwise.
• This issue contains only one bug.

Affected version

2.8.1

Description of the problem

Since Chart.js V3 spanGaps for a LineChart does support boolean and number parameter to define at what point the line should not be drawn.
OLD: (https://www.chartjs.org/docs/2.9.4/charts/line.html#line-styling)
NEW: (https://www.chartjs.org/docs/latest/api/interfaces/LineControllerChartOptions.html#spangaps)

Steps to reproduce the bug

new LineOptions().setSpanGaps(60*1000); does not work

Additional information

No response

[AB-xdev]

Ty for the report. Feel free to send a PR :)

[dhelml]

Sorry, I'm not used to Git or GitHub and I don't have time to learn it at the moment.

[dhelml]

Works great, thanks