possibility to collapse blocks in JSON expanded documents in Discovery

[dcolazin]

Describe the feature: currently, the JSON expanded documents are formatted with colors and tabs to improve readability, but in some cases (nested or very long fields) there might be too much information and the Discover feature might not be useful to extract the needed data in the fastest and best way. It would be nice to have the possibility to collapse nested fields and arrays like in many JSON viewers.

Describe a specific use case for the feature: for example, it is possible to have 160+ addresses in logs or whole fields not needed for the troubleshooting in progress.

[elasticmachine]

Pinging @elastic/kibana-data-discovery (Team:DataDiscovery)

[kertal]

@dcolazin thx was resolved in #92442

[dcolazin]

@kertal True, but very long (string) fields (for example, stacktraces) are still an issue.

[kertal]

how should be this be handled in your opinion?

[dcolazin]

@kertal For example, how the Firefox JSON viewer does - similarly as arrays and subobjects, long strings should be collapsible