Add support to allow auto-completion and diagnostics for playbook adjacent collections

[ganeshrn]

Problem

Ansible plugin developers prefer to have collection adjacent to playbook while developing plugins, currently playbook adjacent collections are not supported for auto-completion and diagnostics.

Solution

The ansibleConfig collections_path array should be updated with the workspace root folders to search playbook adjacent collections if that particular client setting is enabled. https://github.com/ansible/vscode-ansible/issues/324

Alternatives

No response

Additional context

No response