Add data store management to XUI

[krausvo1]

This PR adds data stores (identity repositories) management to XUI.

Data store management offers the same features as it did in openam-console - listing, creating, editing and deleting realm specific data stores.

Implementation details:

• Implicit idRepositoryService REST API endpoints have been exposed under "datastores" resource name and used in XUI. Only organization subschemas have been exposed, global schema of the service has not been exposed.
• To support grouping data store attributes to sections, *.section.properties has been created for every data store type. All properties originate from sunIdentityRepositoryService.section.properties that is used by openam-console. Some data stores' attributes are not present in that file and neither are they in new files.
• Matching openam-console's behavior, only attributes assigned to a section are displayed in the UI.
• When creating new data store, only fields for required attributes or attributes without default value are present.
• Option to "Load schema when finished" that is available when creating/editing data store in openam-console was not transferred to XUI.

Known shortcomings:

• Form field validations are not in ideal state. Required fields are not marked as required in any way and BE notifications with validation errors refer to invalid attributes instead of their translations (field labels). These shortcomings are already present in XUI and would probably require more complex refactoring.
• Data store name field validation is probably too loose, some characters can cause 500 during submit or 400 during data store read.

All openam-console code has been preserved.

[krausvo1]

I have dropped commit upgrading grunt-eslint and grunt-sync that is already present in https://github.com/WrenSecurity/wrenam/pull/165.

[krausvo1]

Since we want to rewrite AMD files to ESM in the future, I will rewrite all files added here to ESM to not add more legacy code.

[krausvo1]

Done. @pavelhoral ready for review :)