Remove Moment.js dependency in kbn-datemath

[lukasolson]

Right now, the kbn-datemath package has only one dependency - Moment.js. As Moment.js is no longer actively developed, so we would like to consider how feasible it would be to remove it as a dependency. Starting with the kbn-datemath package might be a good starting point since it is a fairly small package.

[elasticmachine]

Pinging @elastic/kibana-data-discovery (Team:DataDiscovery)

[kertal]

I think one of the problem here, that it's not enough to remove or replace the dependency, as consumers are passing in its moment instances, for having the right locales.

kibana/packages/kbn-datemath/index.ts

Lines 51 to 56 in 1cbf83f

	/*
	* This is a simplified version of elasticsearch's date parser.
	* If you pass in a momentjs instance as the third parameter the calculation
	* will be done using this (and its locale settings) instead of the one bundled
	* with this library.
	*/

[kertal]

Sending this to the icebox for now, it's also blocked, because to remove the Moment.js dependency, we need to make sure consumers need to no longer provide Moment instances. So this could be done in a high likely big effort to remove the Moment.js dependency from Kibana

[timductive]

Closing this because it's not planned to be resolved in the foreseeable future. It will be tracked in our Icebox and will be re-opened if our priorities change. Feel free to re-open if you think it should be melted sooner.