Allow to configure hidden columns in featuregrid

[dsuren1]

Description

Allow user configuration of the feature grid columns to be saved on map save and also in usersession when user session plugin is enabled. It should be applicable for both map and context

Ref: georchestra/mapstore2-georchestra#378

Acceptance criteria

Save attribute table column state

• On map save
• In user session

[offtherailz]

Hi, my understanding is that here we are saving only the attributes selected for the current layer (last) of the feature grid.
I think these settings should be saved ideally layer by layer. So we should have a by-id reference.

please @tdipisa and @dsuren1 clarify this to me so I can proceed with the review.

Moreover take into account to use the new registerCustomSaveHandler actually used for MapViews and in some extensions, to add data to the map configuration.
This new solution is more modular and should allow to separate more the plugins from the general save logic. Anyway I'm not sure if session tool can handle this.

[tdipisa]

@offtherailz we have to make persistent in map state when saving the map and in user session the status of visible attributes in Attribute table. Therefore yes, it should be managed for each layer in theory, I think. That's should be the logic, why are you asking? Can it be also different maybe?

[dsuren1]

@offtherailz

So we should have a by-id reference.

I believe now it saves all attributes reference by map for all layers in it.

[offtherailz]

I can confirm you are right. My apologies for the noise

[tdipisa]

I'm sorry @offtherailz who is right and for what? :-)

[offtherailz]

@dsuren1 is right, the feature grid saves layer by layer the options.
I probably did an error during the preliminary check.

[tdipisa]

Ok @offtherailz. Thank you.

[tdipisa]

@offtherailz @ElenaGallo @dsuren1
I don't know what has been tested so far but it seems the requested support for User Session involving this new enhancement is not working as expected:

The support for map save seems working as expected instead.
Moving back to ready for further checks.