timeseries: keep all digits for step values in scalar cards

[yatbear]

To make the step values more meaningful, e.g. display 1,001,001 instead of just 1M.

Visualization:

Googlers, see issue.

#onduty

[stephanwlee]

This definitely is not the scalable way so I think it would be much better to display their actual value.

Since TensorBoard is used in a scientific setting, even when very long, I think it is much nicer to show their actual value in full length especially in a tooltip.

As such, we want to use something like Intl.NumberFormat.

> new Intl.NumberFormat().format(10010000)
< // At the very least, ","s in between number lets you read the number much easily.
< '10,010,000'

[yatbear]

This definitely is not the scalable way so I think it would be much better to display their actual value.

Since TensorBoard is used in a scientific setting, even when very long, I think it is much nicer to show their actual value in full length especially in a tooltip.

As such, we want to use something like Intl.NumberFormat.

> new Intl.NumberFormat().format(10010000)
< // At the very least, ","s in between number lets you read the number much easily.
< '10,010,000'

Done. Thanks!