[DataSource] Restrict data source creation/update/delete when manageableBy is none or dashboard_admin

[yubonluo]

Is your feature request related to a problem? Please describe.

Adding an optional setting that controls the permissions of data source to create, update and delete.
data_source.editMode: "read_only|admin_only|none"
"all": The data source is readonly for all users.
"dashboard_admin": The data source can only be managed by dashboard admin.((#6389) ).
"all": The data source can be managed by all users. Default to "all".

Describe the solution you'd like

Before editing a data source, data source permission client wrapper will verify the data source edit mode.

Describe alternatives you've considered

Additional context

#4944

[BionIT]

Hi @yubonluo, thanks for opening the issue! Are we targeting this in 2.16?

[yubonluo]

Hi @yubonluo, thanks for opening the issue! Are we targeting this in 2.16?

Hi @BionIT , The PR regarding this issue will be submitted in the next two days, with releasing on 2.15.