[i18n] Check usage of FormattedNumber instead of Numeral JS

[maryia-lapata]

Check whether we can use FormattedNumber instead of Numeral JS and whether we should set the locale for Numeral JS according to i18n.locale preference.

Note: There is a field Formatting locale in Advanced settings that is related to locale for Numeral JS

/cc @azasypkin

[elasticmachine]

Pinging @elastic/kibana-platform

[elasticmachine]

Pinging @elastic/kibana-app

[markov00]

related to : #25993 and #8583

[azasypkin]

Also dates and numbers in node won't be formatted properly without solving #20288

[Bamieh]

I tried working on this issue and it seems that it needs a lot of time to fully resolve. I prefer to delay it to see how critical it is given the amount of time it will require to resolve.

[wylieconlon]

Left this comment in a few other places, but we can start targeting 8.0 for usage of Intl.NumberFormat because it will be supported in node by then. It might not be able to replace our existing usage immediately, but we can start transitioning.

[elasticmachine]

Pinging @elastic/kibana-app-arch (Team:AppArch)

[ppisljar]

Thank you for contributing to this issue, however, we are closing this issue due to inactivity as part of a backlog grooming effort. If you believe this feature/bug should still be considered, please reopen with a comment.