Opensearch discover link support

[nsano-rururu]

• [ ] generate_opensearch_discover_url
• [ ] opensearch_discover_url
• [ ] opensearch_discover_app_url
• [ ] opensearch_discover_index_pattern_id
• [ ] opensearch_discover_version
• [ ] opensearch_discover_from_timedelta
• [ ] opensearch_discover_to_timedelta
• [ ] mattermost_attach_opensearch_discover_url
• [ ] mattermost_opensearch_discover_color
• [ ] mattermost_opensearch_discover_title
• [ ] ms_teams_attach_opensearch_discover_url
• [ ] ms_teams_opensearch_discover_title
• [ ] rocket_chat_attach_opensearch_discover_url
• [ ] rocket_chat_opensearch_discover_color
• [ ] rocket_chat_opensearch_discover_title
• [ ] slack_attach_opensearch_discover_url
• [ ] slack_opensearch_discover_color
• [ ] slack_opensearch_discover_title
• [ ] ms_power_automate_opensearch_discover_attach_url
• [ ] ms_power_automate_opensearch_discover_title
• [ ] ms_power_automate_opensearch_discover_color