added default sort order to dataGrid

[anishagg17]

Summary

Fixes : #2974
added default sort order to dataGrid

Checklist

• Check against all themes for compatibility in both light and dark modes
• Checked in mobile
• Checked in IE11 and Firefox
• Props have proper autodocs
• Added documentation examples
• Added or updated jest tests
• Checked for breaking changes and labeled appropriately
• Checked for accessibility including keyboard-only and screenreader modes
• A changelog entry exists and is marked appropriately

[kibanamachine]

Since this is a community submitted pull request, a Jenkins build has not been kicked off automatically. Can an Elastic organization member please verify the contents of this patch and then kick off a build manually?

[anishagg17]

@myasonik @chandlerprall I have added default 'desc' property to version and date column
and default 'asc' property to name field

if no default is supplied as a prop 'asc' sorting would be performed

[chandlerprall]

Couple changes requested, also: we'll want to add a defaultSortDirection prop on EuiDataGridSchemaDetector which should be used if the value isn't overridden by a column.

Loosely, initialSortDirection = column.defaultSortDirection || columnSchema.defaultSortDirection || 'asc'

[anishagg17]

@chandlerprall changes have been made

[chandlerprall]

Changes LGTM! Pulled and tested locally

[chandlerprall]

jenkins test this

[kibanamachine]

Preview documentation changes for this PR: https://eui.elastic.co/pr_2987/