chore(ui5-date-picker): rename component

[fifoosid]

BREAKING_CHANGE: ui5-datepicker is renamed to ui5-date-picker

[vladitasev]

I would suggest to also define the old version for some time before breaking it completely.

[ilhan007]

Just one thing: we have this.getMetadata().getTag(), this _getElementsWithMultipleTags in UI5Element look very strange to me. I would go for a implementation at metadata level.

[vladitasev]

Regarding the tags and metadata, I thought about it and I would like to see the following API:

const metadtata = {
  tag: "ui5-time-picker",
  altTag: "ui5-timepicker"
}

and then in Metadata.js just a new function getAltTag and for the ones that have it, we'll register it twice.

outdated