[SD-1462] Added custom data source for media index.

[MdNadimHossain]

JIRA issue: https://digital-vic.atlassian.net/browse/SD-1462

Changed

1. Added a custom data source to handle media items named "Filtered Media". In config the user can choose the media type and in the drop down it will list the available boolean field in media entity type. Based on the boolean field It will build the tracker. This will help reduce the indexing time for media items and only index media items which will be set as true in the boolean field

Test branch in content- vic -
https://nginx-php.pr-1960.content-vic.sdp4.sdp.vic.gov.au/
FE - https://app.pr-1320.vic-gov-au.sdp4.sdp.vic.gov.au/search-dtp-technical-publications
Index - https://sdp3.kb.australiaeast.azure.elastic-cloud.com:9243/app/enterprise_search/content/search_indices/a83890f7a31dea14e1ae83c6f0afacca--elasticsearch_index_custom_datasource_media/documents

Screenshots

screen-capture.1.webm

[MdNadimHossain]

changed it to query the table from the DB directly