Preview of source tables data

[naveenpatnana]

we need to preview the source table data on fly when creating the connection, while selecting the source tables.

Usecase:
While selecting the tables it is becoming tough to differentiate the tables based on their names, so if we have a feature that shows the preview of some sample data(like 100 rows per table), then it will be helpful.

[geektuhin123]

We need the ability to preview the data during the discover schema phase
so
we load the data -> preview data ( say 50 rows ) -> discover schema -> select schema / apply transformation -> destination

A preview of data will help users to manage the schema they want for the destination.

[ChristopheDuong]

It'd also be helpful for users to see a preview of data when trying to select the primary keys when configuring a deduplicated stream from a source.

As a user that does not know instinctively the primary keys of a source, it would help to get a preview of data (extra bonus is to have statistic on values too) populating certain columns before deciding if it is indeed useable as a unique primary key or not

[octavia-squidington-iv]

cc @airbytehq/frontend