Make Dataset entity bundle-able like media entity and allow selecting source resource

Problem/Motivation

SourceResource field should not be added as a basefield to the Dataset entity. It makes data_pipelines table grow, if there is a new SourceResource is added. Most of these add columns are empty.

DESCRIBE data_pipelines;
+------------------------+---------------------+------+-----+---------+----------------+
| Field                  | Type                | Null | Key | Default | Extra          |
+------------------------+---------------------+------+-----+---------+----------------+
| id                     | int(10) unsigned    | NO   | PRI | NULL    | auto_increment |
| source                 | varchar(255)        | NO   |     | NULL    |                |
| uuid                   | varchar(128)        | NO   | UNI | NULL    |                |
| name                   | varchar(255)        | YES  |     | NULL    |                |
| pipeline               | varchar(255)        | YES  | MUL | NULL    |                |
| status                 | varchar(255)        | YES  | MUL | NULL    |                |
| csv_file__target_id    | int(10) unsigned    | YES  | MUL | NULL    |                |
| csv_file__display      | tinyint(3) unsigned | YES  |     | 1       |                |
| csv_file__description  | text                | YES  |     | NULL    |                |
| csv_text               | longtext            | YES  |     | NULL    |                |
| csv_uri__uri           | varchar(2048)       | YES  | MUL | NULL    |                |
| csv_uri__title         | varchar(255)        | YES  |     | NULL    |                |
| csv_uri__options       | longblob            | YES  |     | NULL    |                |
| json_file__target_id   | int(10) unsigned    | YES  | MUL | NULL    |                |
| json_file__display     | tinyint(3) unsigned | YES  |     | 1       |                |
| json_file__description | text                | YES  |     | NULL    |                |
| json_text              | longtext            | YES  |     | NULL    |                |
| json_uri__uri          | varchar(2048)       | YES  | MUL | NULL    |                |
| json_uri__title        | varchar(255)        | YES  |     | NULL    |                |
| json_uri__options      | longblob            | YES  |     | NULL    |                |
| json_path_to_data      | varchar(255)        | YES  |     | NULL    |                |
+------------------------+---------------------+------+-----+---------+----------------+
21 rows in set (0.002 sec)

Steps to reproduce

See the problem statement

Proposed resolution

Make Dataset entity bundle-able just like media entity in core and allow selecting source resource on bundle creation screen. It will allow
Dataset entity to create source resource field as bundlefield or configurable field.

Remaining tasks

• Discussion -> Developement -> Fix
• Discussion -> Disagreement-> Won't Fix

User interface changes

Dataset entity will be bundle-able

API changes

Source resource field is not a basefield.

Data model changes

data_pipelines will not have empty columns.