Support _mvt endpoint

[thomasneirynck]

🚀 Feature Proposal

Support the _mvt endpoint.

_mvt is a new endpoint for geo-data that returns a binary response elastic/elasticsearch#58696

An initial version has been merged into master behind a feature-flag elastic/elasticsearch#73872.

Motivation

This will be required for JS-clients. Specifically, the Maps-application in Kibana will need to use this.

Example

// Get binary mvt-tile with  coordinate 1/3/2, for geo-field `geometry` of index `tornadoes`
const mvtTile = await client.mvt({
   index: 'tornadoes',
   x: 3,
   y: 2,
   z: 1,
   field: 'geometry'
   body: {...}
);

cc @iverase

[delvedor]

I'll open a PR to support the new content type directly in the client.

[delvedor]

Done in #1500.