Introduce JQ type of filtering in key/value search

[igroeg]

Problem / Motivation

AKHQ’s current key/value search is useful for simple substring matching, but it becomes hard to use when:
• payloads are JSON (or JSON-like) and we need field-level conditions
• we want complex predicates (AND/OR), nested fields, arrays
• we want quick ad-hoc “find records where X holds” without exporting data elsewhere

In practice, this pushes users to copy/paste messages into external tools (jq, scripts, IDE) which breaks the workflow and is slow for incident/debugging scenarios.

Proposed Feature

Introduce JQ-like filtering for message search on key and/or value.

UX proposal

• Add a toggle or dropdown in the search UI:
• Simple (existing behavior)
• JQ filter (new)
• When JQ filter is selected, interpret the input as a jq expression applied to the records; The filtration should be serialization agnostic (working with JSON, Avro, ProtoBuff)

Please let me know what you think. If you find value in it, I could also give it a try to implement it.