[Maps] Add vector drawing & persisting functionality to Maps app

[kindsun]

Following the prototype POC #96365 and to resolve #41469, this issue describes the requirements and steps needed to add vector drawing capability to the Maps app.

This feature should include the following capabilties:

• Draw standard shapes including point, linestring, polygon, bounding box, and circle
• Save drawn shapes to a new or existing Elasticsearch index
• Remove and edit data, minimally including current or previously drawn data, maximally including data indexed by other means
• Launch draw tools both as a means to create a new layer and as an edit tool on existing document layers

This feature will be broken down into the following steps which will likely grow and change as we move forward. Several of these features will be broken out of the existing POC:

• Endpoint for index creation. Since this is the first PR, also add feature flag ([Maps] Add endpoint to server for creating empty index & index pattern #94028)
• Endpoint for feature addition ([Maps] Add drawing index data endpoint #94728)
• Barebones wizard for vector drawing layer creation that just creates index & index pattern ([Maps] Add shape drawing wizard- creates index only #96913)
• Draw toolbar enabled on document layers with additive capability ([Maps] Add layer edit controls #99812)
• Endpoint for feature removal & UI removal capability ([Maps] Add capability to delete features from layer & index #103145)
• Create workflow tying together wizard and toolbar (issue: [Maps] Improve new draw shape flow #102537) (PR: [Maps] Design updates for draw shape mode and timeslider #103493)
• Add/edit keyword fields (others?) via tooltip
• Add functional tests for draw capabilities. Consider adding similar tests for filtering (can be separate PR). See lock tooltip test code for reference
• Freehand draw capability? (see [Maps] POC adding experimental vector drawing layer functionality to the Maps app #96365 (comment))

cc @kmartastic @thomasneirynck

[elasticmachine]

Pinging @elastic/kibana-gis (Team:Geo)

[kindsun]

Open questions about overall flow for design and Maps team:

• Can we confirm we like the draw toolbar as a home for feature editing? Does the toolbar make sense in its current location as done in the POC?
• Should there be a confirmation step when each feature is updated? More broadly, what should the feature add/edit flow look like?
• How should this merge with the filter capability? Should we try to differentiate this from filter capability? (different colors, other?)
• Does the current method of picking index patterns via pop-up (same as filters) make sense?
• How should editing feature attributes work? Should this be a feature-by-feature pop-up? If features are added to an existing index, can they select which attributes to update? Do they have to do this for each feature?

[kmartastic]

Path forward:

New Layer Flow
-Add Layer > Create Index
-Automatically start editing > Show toolbar with appropriate controls

Edit Existing Layer Flow
-Map has editable layers
-Click Tools > Edit layer by selecting appropriate index + layer combination
-Show toolbar with appropriate controls

Questions:

1. Do we need a commit per new document? per editing session?
2. Can we support automatic inclusion of attributes for new blank layer? what about existing layer?

@aaronjcaldwell @miukimiu @nreese @thomasneirynck anything missing?

[thomasneirynck]

Closed with #41469

Can follow up on outstanding items as they come up.