Improve log context field filtering

[ddelemeny]

cf : https://github.com/quickwit-oss/quickwit-datasource/pull/45#discussion_r1480647233

Fields shown in the log context sidebar may not be relevant filters. There may not be a sensible default exclusion list.

How can this be improved ?

[ddelemeny]

Commit e8f94ee comments out the exclusion list, leaving the primitive type test as the only filter. Let's see how that goes.