Fix and enhance search

[AlexisSouquiere]

Fix #1532

This PR keeps the current behaviour that splits the search string by whitespace to build multiple search patterns. But the way it was supposed to works was confusing. For instance, by giving the following search string value to search with Contains option, the result could return records that contain only to whereas users were expecting records that contain value to search.

• Allow giving a single pattern that contains whitespaces by enclosing it with double quotes (ex: "value to search")
• Support complex patterns like searching for JSON key/value where we need to escape double quotes
• Add details on the way the search works. Especially on the whitespace split + AND/OR operator in case of multiple patterns

On the following example, we are looking for records where the value contains P1 OR "field 1":"v1"

[teimyBr]

Seems like the filter now works a way better :D